From b155dbc09315c4da1e7ec68826f914c96a7de760 Mon Sep 17 00:00:00 2001
From: Hiroyuki Adachi <hiroxpepe@gmail.com>
Date: Wed, 2 Mar 2022 20:39:38 +0900
Subject: [PATCH] refactor: #13 keeping codes clean.

---
 MidiPlayer.Droid/MainActivity.Component.cs | 440 ++++++++++-----------
 MidiPlayer.Droid/MainActivity.cs           | 168 ++++----
 MidiPlayer.FluidSynth/Synth.cs             | 286 +++++++-------
 MidiPlayer.Midi/StandardMidiFile.cs        |  84 ++--
 MidiPlayer.SoundFont/SoundFont .cs         |  36 +-
 MidiPlayer.Win64/MainForm.Designer.cs      | 112 +++---
 MidiPlayer.Win64/MainForm.cs               | 110 +++---
 MidiPlayer/Conf.cs                         |  42 +-
 MidiPlayer/Env.cs                          |  20 +-
 MidiPlayer/EventQueue.cs                   |  28 +-
 MidiPlayer/Log.cs                          |  26 +-
 MidiPlayer/PlayList.cs                     |  22 +-
 MidiPlayerTests/PlayListTests.cs           |  32 +-
 MidiPlayerTests/PrivateObject.cs           |  16 +-
 MidiPlayerTests/SoundFontTests.cs          |  14 +-
 MidiPlayerTests/StandardMidiFileTests.cs   | 230 +++++------
 MidiPlayerTests/SynthTests.cs              |  40 +-
 17 files changed, 853 insertions(+), 853 deletions(-)

diff --git a/MidiPlayer.Droid/MainActivity.Component.cs b/MidiPlayer.Droid/MainActivity.Component.cs
index 06e8f0e..0ab5d28 100644
--- a/MidiPlayer.Droid/MainActivity.Component.cs
+++ b/MidiPlayer.Droid/MainActivity.Component.cs
@@ -15,263 +15,263 @@ public partial class MainActivity : AppCompatActivity {
         /// initialize the component.
         /// </summary>
         void initializeComponent() {
-            var _buttonloadSoundFont = FindViewById<Button>(Resource.Id.button_load_soundfont);
-            _buttonloadSoundFont.Click += buttonLoadSoundFont_Click;
+            var buttonloadSoundFont = FindViewById<Button>(Resource.Id.button_load_soundfont);
+            buttonloadSoundFont.Click += buttonLoadSoundFont_Click;
 
-            var _buttonloadMidiFile = FindViewById<Button>(Resource.Id.button_load_midifile);
-            _buttonloadMidiFile.Click += buttonLoadMidiFile_Click;
+            var buttonloadMidiFile = FindViewById<Button>(Resource.Id.button_load_midifile);
+            buttonloadMidiFile.Click += buttonLoadMidiFile_Click;
 
-            var _buttonStart = FindViewById<Button>(Resource.Id.button_start);
-            _buttonStart.Click += buttonStart_Click;
+            var buttonStart = FindViewById<Button>(Resource.Id.button_start);
+            buttonStart.Click += buttonStart_Click;
 
-            var _buttonStop = FindViewById<Button>(Resource.Id.button_stop);
-            _buttonStop.Click += buttonStop_Click;
+            var buttonStop = FindViewById<Button>(Resource.Id.button_stop);
+            buttonStop.Click += buttonStop_Click;
 
-            var _buttonAddPlaylist = FindViewById<Button>(Resource.Id.button_add_playlist);
-            _buttonAddPlaylist.Click += buttonAddPlaylist_Click;
+            var buttonAddPlaylist = FindViewById<Button>(Resource.Id.button_add_playlist);
+            buttonAddPlaylist.Click += buttonAddPlaylist_Click;
 
-            var _buttonDeletePlaylist = FindViewById<Button>(Resource.Id.button_delete_playlist);
-            _buttonDeletePlaylist.Click += buttonDeletePlaylist_Click;
+            var buttonDeletePlaylist = FindViewById<Button>(Resource.Id.button_delete_playlist);
+            buttonDeletePlaylist.Click += buttonDeletePlaylist_Click;
 
             // fader1
-            var _numberPickerProg_1 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_1);
-            _numberPickerProg_1.MinValue = 1;
-            _numberPickerProg_1.MaxValue = 128;
-            var _numberPickerPan_1 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_1);
-            _numberPickerPan_1.MinValue = 1;
-            _numberPickerPan_1.MaxValue = 128;
-            _numberPickerPan_1.Value = 65;
-            var _numberPickerVol_1 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_1);
-            _numberPickerVol_1.MinValue = 1;
-            _numberPickerVol_1.MaxValue = 128;
-            _numberPickerVol_1.Value = 104;
-            var _buttonSendSynth_1 = FindViewById<Button>(Resource.Id.button_send_synth_1);
-            _buttonSendSynth_1.Click += buttonSendSynth_1_Click;
+            var numberPickerProg_1 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_1);
+            numberPickerProg_1.MinValue = 1;
+            numberPickerProg_1.MaxValue = 128;
+            var numberPickerPan_1 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_1);
+            numberPickerPan_1.MinValue = 1;
+            numberPickerPan_1.MaxValue = 128;
+            numberPickerPan_1.Value = 65;
+            var numberPickerVol_1 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_1);
+            numberPickerVol_1.MinValue = 1;
+            numberPickerVol_1.MaxValue = 128;
+            numberPickerVol_1.Value = 104;
+            var buttonSendSynth_1 = FindViewById<Button>(Resource.Id.button_send_synth_1);
+            buttonSendSynth_1.Click += buttonSendSynth_1_Click;
 
             // fader2
-            var _numberPickerProg_2 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_2);
-            _numberPickerProg_2.MinValue = 1;
-            _numberPickerProg_2.MaxValue = 128;
-            var _numberPickerPan_2 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_2);
-            _numberPickerPan_2.MinValue = 1;
-            _numberPickerPan_2.MaxValue = 128;
-            _numberPickerPan_2.Value = 65;
-            var _numberPickerVol_2 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_2);
-            _numberPickerVol_2.MinValue = 1;
-            _numberPickerVol_2.MaxValue = 128;
-            _numberPickerVol_2.Value = 104;
-            var _buttonSendSynth_2 = FindViewById<Button>(Resource.Id.button_send_synth_2);
-            _buttonSendSynth_2.Click += buttonSendSynth_2_Click;
+            var numberPickerProg_2 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_2);
+            numberPickerProg_2.MinValue = 1;
+            numberPickerProg_2.MaxValue = 128;
+            var numberPickerPan_2 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_2);
+            numberPickerPan_2.MinValue = 1;
+            numberPickerPan_2.MaxValue = 128;
+            numberPickerPan_2.Value = 65;
+            var numberPickerVol_2 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_2);
+            numberPickerVol_2.MinValue = 1;
+            numberPickerVol_2.MaxValue = 128;
+            numberPickerVol_2.Value = 104;
+            var buttonSendSynth_2 = FindViewById<Button>(Resource.Id.button_send_synth_2);
+            buttonSendSynth_2.Click += buttonSendSynth_2_Click;
 
             // fader3
-            var _numberPickerProg_3 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_3);
-            _numberPickerProg_3.MinValue = 1;
-            _numberPickerProg_3.MaxValue = 128;
-            var _numberPickerPan_3 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_3);
-            _numberPickerPan_3.MinValue = 1;
-            _numberPickerPan_3.MaxValue = 128;
-            _numberPickerPan_3.Value = 65;
-            var _numberPickerVol_3 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_3);
-            _numberPickerVol_3.MinValue = 1;
-            _numberPickerVol_3.MaxValue = 128;
-            _numberPickerVol_3.Value = 104;
-            var _buttonSendSynth_3 = FindViewById<Button>(Resource.Id.button_send_synth_3);
-            _buttonSendSynth_3.Click += buttonSendSynth_3_Click;
+            var numberPickerProg_3 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_3);
+            numberPickerProg_3.MinValue = 1;
+            numberPickerProg_3.MaxValue = 128;
+            var numberPickerPan_3 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_3);
+            numberPickerPan_3.MinValue = 1;
+            numberPickerPan_3.MaxValue = 128;
+            numberPickerPan_3.Value = 65;
+            var numberPickerVol_3 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_3);
+            numberPickerVol_3.MinValue = 1;
+            numberPickerVol_3.MaxValue = 128;
+            numberPickerVol_3.Value = 104;
+            var buttonSendSynth_3 = FindViewById<Button>(Resource.Id.button_send_synth_3);
+            buttonSendSynth_3.Click += buttonSendSynth_3_Click;
 
             // fader4
-            var _numberPickerProg_4 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_4);
-            _numberPickerProg_4.MinValue = 1;
-            _numberPickerProg_4.MaxValue = 128;
-            var _numberPickerPan_4 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_4);
-            _numberPickerPan_4.MinValue = 1;
-            _numberPickerPan_4.MaxValue = 128;
-            _numberPickerPan_4.Value = 65;
-            var _numberPickerVol_4 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_4);
-            _numberPickerVol_4.MinValue = 1;
-            _numberPickerVol_4.MaxValue = 128;
-            _numberPickerVol_4.Value = 104;
-            var _buttonSendSynth_4 = FindViewById<Button>(Resource.Id.button_send_synth_4);
-            _buttonSendSynth_4.Click += buttonSendSynth_4_Click;
+            var numberPickerProg_4 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_4);
+            numberPickerProg_4.MinValue = 1;
+            numberPickerProg_4.MaxValue = 128;
+            var numberPickerPan_4 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_4);
+            numberPickerPan_4.MinValue = 1;
+            numberPickerPan_4.MaxValue = 128;
+            numberPickerPan_4.Value = 65;
+            var numberPickerVol_4 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_4);
+            numberPickerVol_4.MinValue = 1;
+            numberPickerVol_4.MaxValue = 128;
+            numberPickerVol_4.Value = 104;
+            var buttonSendSynth_4 = FindViewById<Button>(Resource.Id.button_send_synth_4);
+            buttonSendSynth_4.Click += buttonSendSynth_4_Click;
 
             // fader5
-            var _numberPickerProg_5 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_5);
-            _numberPickerProg_5.MinValue = 1;
-            _numberPickerProg_5.MaxValue = 128;
-            var _numberPickerPan_5 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_5);
-            _numberPickerPan_5.MinValue = 1;
-            _numberPickerPan_5.MaxValue = 128;
-            _numberPickerPan_5.Value = 65;
-            var _numberPickerVol_5 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_5);
-            _numberPickerVol_5.MinValue = 1;
-            _numberPickerVol_5.MaxValue = 128;
-            _numberPickerVol_5.Value = 104;
-            var _buttonSendSynth_5 = FindViewById<Button>(Resource.Id.button_send_synth_5);
-            _buttonSendSynth_5.Click += buttonSendSynth_5_Click;
+            var numberPickerProg_5 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_5);
+            numberPickerProg_5.MinValue = 1;
+            numberPickerProg_5.MaxValue = 128;
+            var numberPickerPan_5 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_5);
+            numberPickerPan_5.MinValue = 1;
+            numberPickerPan_5.MaxValue = 128;
+            numberPickerPan_5.Value = 65;
+            var numberPickerVol_5 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_5);
+            numberPickerVol_5.MinValue = 1;
+            numberPickerVol_5.MaxValue = 128;
+            numberPickerVol_5.Value = 104;
+            var buttonSendSynth_5 = FindViewById<Button>(Resource.Id.button_send_synth_5);
+            buttonSendSynth_5.Click += buttonSendSynth_5_Click;
 
             // fader6
-            var _numberPickerProg_6 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_6);
-            _numberPickerProg_6.MinValue = 1;
-            _numberPickerProg_6.MaxValue = 128;
-            var _numberPickerPan_6 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_6);
-            _numberPickerPan_6.MinValue = 1;
-            _numberPickerPan_6.MaxValue = 128;
-            _numberPickerPan_6.Value = 65;
-            var _numberPickerVol_6 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_6);
-            _numberPickerVol_6.MinValue = 1;
-            _numberPickerVol_6.MaxValue = 128;
-            _numberPickerVol_6.Value = 104;
-            var _buttonSendSynth_6 = FindViewById<Button>(Resource.Id.button_send_synth_6);
-            _buttonSendSynth_6.Click += buttonSendSynth_6_Click;
+            var numberPickerProg_6 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_6);
+            numberPickerProg_6.MinValue = 1;
+            numberPickerProg_6.MaxValue = 128;
+            var numberPickerPan_6 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_6);
+            numberPickerPan_6.MinValue = 1;
+            numberPickerPan_6.MaxValue = 128;
+            numberPickerPan_6.Value = 65;
+            var numberPickerVol_6 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_6);
+            numberPickerVol_6.MinValue = 1;
+            numberPickerVol_6.MaxValue = 128;
+            numberPickerVol_6.Value = 104;
+            var buttonSendSynth_6 = FindViewById<Button>(Resource.Id.button_send_synth_6);
+            buttonSendSynth_6.Click += buttonSendSynth_6_Click;
 
             // fader7
-            var _numberPickerProg_7 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_7);
-            _numberPickerProg_7.MinValue = 1;
-            _numberPickerProg_7.MaxValue = 128;
-            var _numberPickerPan_7 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_7);
-            _numberPickerPan_7.MinValue = 1;
-            _numberPickerPan_7.MaxValue = 128;
-            _numberPickerPan_7.Value = 65;
-            var _numberPickerVol_7 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_7);
-            _numberPickerVol_7.MinValue = 1;
-            _numberPickerVol_7.MaxValue = 128;
-            _numberPickerVol_7.Value = 104;
-            var _buttonSendSynth_7 = FindViewById<Button>(Resource.Id.button_send_synth_7);
-            _buttonSendSynth_7.Click += buttonSendSynth_7_Click;
+            var numberPickerProg_7 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_7);
+            numberPickerProg_7.MinValue = 1;
+            numberPickerProg_7.MaxValue = 128;
+            var numberPickerPan_7 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_7);
+            numberPickerPan_7.MinValue = 1;
+            numberPickerPan_7.MaxValue = 128;
+            numberPickerPan_7.Value = 65;
+            var numberPickerVol_7 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_7);
+            numberPickerVol_7.MinValue = 1;
+            numberPickerVol_7.MaxValue = 128;
+            numberPickerVol_7.Value = 104;
+            var buttonSendSynth_7 = FindViewById<Button>(Resource.Id.button_send_synth_7);
+            buttonSendSynth_7.Click += buttonSendSynth_7_Click;
 
             // fader8
-            var _numberPickerProg_8 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_8);
-            _numberPickerProg_8.MinValue = 1;
-            _numberPickerProg_8.MaxValue = 128;
-            var _numberPickerPan_8 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_8);
-            _numberPickerPan_8.MinValue = 1;
-            _numberPickerPan_8.MaxValue = 128;
-            _numberPickerPan_8.Value = 65;
-            var _numberPickerVol_8 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_8);
-            _numberPickerVol_8.MinValue = 1;
-            _numberPickerVol_8.MaxValue = 128;
-            _numberPickerVol_8.Value = 104;
-            var _buttonSendSynth_8 = FindViewById<Button>(Resource.Id.button_send_synth_8);
-            _buttonSendSynth_8.Click += buttonSendSynth_8_Click;
+            var numberPickerProg_8 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_8);
+            numberPickerProg_8.MinValue = 1;
+            numberPickerProg_8.MaxValue = 128;
+            var numberPickerPan_8 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_8);
+            numberPickerPan_8.MinValue = 1;
+            numberPickerPan_8.MaxValue = 128;
+            numberPickerPan_8.Value = 65;
+            var numberPickerVol_8 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_8);
+            numberPickerVol_8.MinValue = 1;
+            numberPickerVol_8.MaxValue = 128;
+            numberPickerVol_8.Value = 104;
+            var buttonSendSynth_8 = FindViewById<Button>(Resource.Id.button_send_synth_8);
+            buttonSendSynth_8.Click += buttonSendSynth_8_Click;
 
             // fader9
-            var _numberPickerProg_9 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_9);
-            _numberPickerProg_9.MinValue = 1;
-            _numberPickerProg_9.MaxValue = 128;
-            var _numberPickerPan_9 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_9);
-            _numberPickerPan_9.MinValue = 1;
-            _numberPickerPan_9.MaxValue = 128;
-            _numberPickerPan_9.Value = 65;
-            var _numberPickerVol_9 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_9);
-            _numberPickerVol_9.MinValue = 1;
-            _numberPickerVol_9.MaxValue = 128;
-            _numberPickerVol_9.Value = 104;
-            var _buttonSendSynth_9 = FindViewById<Button>(Resource.Id.button_send_synth_9);
-            _buttonSendSynth_9.Click += buttonSendSynth_9_Click;
+            var numberPickerProg_9 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_9);
+            numberPickerProg_9.MinValue = 1;
+            numberPickerProg_9.MaxValue = 128;
+            var numberPickerPan_9 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_9);
+            numberPickerPan_9.MinValue = 1;
+            numberPickerPan_9.MaxValue = 128;
+            numberPickerPan_9.Value = 65;
+            var numberPickerVol_9 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_9);
+            numberPickerVol_9.MinValue = 1;
+            numberPickerVol_9.MaxValue = 128;
+            numberPickerVol_9.Value = 104;
+            var buttonSendSynth_9 = FindViewById<Button>(Resource.Id.button_send_synth_9);
+            buttonSendSynth_9.Click += buttonSendSynth_9_Click;
 
             // fader10
-            var _numberPickerProg_10 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_10);
-            _numberPickerProg_10.MinValue = 1;
-            _numberPickerProg_10.MaxValue = 128;
-            var _numberPickerPan_10 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_10);
-            _numberPickerPan_10.MinValue = 1;
-            _numberPickerPan_10.MaxValue = 128;
-            _numberPickerPan_10.Value = 65;
-            var _numberPickerVol_10 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_10);
-            _numberPickerVol_10.MinValue = 1;
-            _numberPickerVol_10.MaxValue = 128;
-            _numberPickerVol_10.Value = 104;
-            var _buttonSendSynth_10 = FindViewById<Button>(Resource.Id.button_send_synth_10);
-            _buttonSendSynth_10.Click += buttonSendSynth_10_Click;
+            var numberPickerProg_10 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_10);
+            numberPickerProg_10.MinValue = 1;
+            numberPickerProg_10.MaxValue = 128;
+            var numberPickerPan_10 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_10);
+            numberPickerPan_10.MinValue = 1;
+            numberPickerPan_10.MaxValue = 128;
+            numberPickerPan_10.Value = 65;
+            var numberPickerVol_10 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_10);
+            numberPickerVol_10.MinValue = 1;
+            numberPickerVol_10.MaxValue = 128;
+            numberPickerVol_10.Value = 104;
+            var buttonSendSynth_10 = FindViewById<Button>(Resource.Id.button_send_synth_10);
+            buttonSendSynth_10.Click += buttonSendSynth_10_Click;
 
             // fader11
-            var _numberPickerProg_11 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_11);
-            _numberPickerProg_11.MinValue = 1;
-            _numberPickerProg_11.MaxValue = 128;
-            var _numberPickerPan_11 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_11);
-            _numberPickerPan_11.MinValue = 1;
-            _numberPickerPan_11.MaxValue = 128;
-            _numberPickerPan_11.Value = 65;
-            var _numberPickerVol_11 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_11);
-            _numberPickerVol_11.MinValue = 1;
-            _numberPickerVol_11.MaxValue = 128;
-            _numberPickerVol_11.Value = 104;
-            var _buttonSendSynth_11 = FindViewById<Button>(Resource.Id.button_send_synth_11);
-            _buttonSendSynth_11.Click += buttonSendSynth_11_Click;
+            var numberPickerProg_11 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_11);
+            numberPickerProg_11.MinValue = 1;
+            numberPickerProg_11.MaxValue = 128;
+            var numberPickerPan_11 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_11);
+            numberPickerPan_11.MinValue = 1;
+            numberPickerPan_11.MaxValue = 128;
+            numberPickerPan_11.Value = 65;
+            var numberPickerVol_11 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_11);
+            numberPickerVol_11.MinValue = 1;
+            numberPickerVol_11.MaxValue = 128;
+            numberPickerVol_11.Value = 104;
+            var buttonSendSynth_11 = FindViewById<Button>(Resource.Id.button_send_synth_11);
+            buttonSendSynth_11.Click += buttonSendSynth_11_Click;
 
             // fader12
-            var _numberPickerProg_12 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_12);
-            _numberPickerProg_12.MinValue = 1;
-            _numberPickerProg_12.MaxValue = 128;
-            var _numberPickerPan_12 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_12);
-            _numberPickerPan_12.MinValue = 1;
-            _numberPickerPan_12.MaxValue = 128;
-            _numberPickerPan_12.Value = 65;
-            var _numberPickerVol_12 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_12);
-            _numberPickerVol_12.MinValue = 1;
-            _numberPickerVol_12.MaxValue = 128;
-            _numberPickerVol_12.Value = 104;
-            var _buttonSendSynth_12 = FindViewById<Button>(Resource.Id.button_send_synth_12);
-            _buttonSendSynth_12.Click += buttonSendSynth_12_Click;
+            var numberPickerProg_12 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_12);
+            numberPickerProg_12.MinValue = 1;
+            numberPickerProg_12.MaxValue = 128;
+            var numberPickerPan_12 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_12);
+            numberPickerPan_12.MinValue = 1;
+            numberPickerPan_12.MaxValue = 128;
+            numberPickerPan_12.Value = 65;
+            var numberPickerVol_12 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_12);
+            numberPickerVol_12.MinValue = 1;
+            numberPickerVol_12.MaxValue = 128;
+            numberPickerVol_12.Value = 104;
+            var buttonSendSynth_12 = FindViewById<Button>(Resource.Id.button_send_synth_12);
+            buttonSendSynth_12.Click += buttonSendSynth_12_Click;
 
             // fader13
-            var _numberPickerProg_13 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_13);
-            _numberPickerProg_13.MinValue = 1;
-            _numberPickerProg_13.MaxValue = 128;
-            var _numberPickerPan_13 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_13);
-            _numberPickerPan_13.MinValue = 1;
-            _numberPickerPan_13.MaxValue = 128;
-            _numberPickerPan_13.Value = 65;
-            var _numberPickerVol_13 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_13);
-            _numberPickerVol_13.MinValue = 1;
-            _numberPickerVol_13.MaxValue = 128;
-            _numberPickerVol_13.Value = 104;
-            var _buttonSendSynth_13 = FindViewById<Button>(Resource.Id.button_send_synth_13);
-            _buttonSendSynth_13.Click += buttonSendSynth_13_Click;
+            var numberPickerProg_13 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_13);
+            numberPickerProg_13.MinValue = 1;
+            numberPickerProg_13.MaxValue = 128;
+            var numberPickerPan_13 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_13);
+            numberPickerPan_13.MinValue = 1;
+            numberPickerPan_13.MaxValue = 128;
+            numberPickerPan_13.Value = 65;
+            var numberPickerVol_13 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_13);
+            numberPickerVol_13.MinValue = 1;
+            numberPickerVol_13.MaxValue = 128;
+            numberPickerVol_13.Value = 104;
+            var buttonSendSynth_13 = FindViewById<Button>(Resource.Id.button_send_synth_13);
+            buttonSendSynth_13.Click += buttonSendSynth_13_Click;
 
             // fader14
-            var _numberPickerProg_14 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_14);
-            _numberPickerProg_14.MinValue = 1;
-            _numberPickerProg_14.MaxValue = 128;
-            var _numberPickerPan_14 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_14);
-            _numberPickerPan_14.MinValue = 1;
-            _numberPickerPan_14.MaxValue = 128;
-            _numberPickerPan_14.Value = 65;
-            var _numberPickerVol_14 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_14);
-            _numberPickerVol_14.MinValue = 1;
-            _numberPickerVol_14.MaxValue = 128;
-            _numberPickerVol_14.Value = 104;
-            var _buttonSendSynth_14 = FindViewById<Button>(Resource.Id.button_send_synth_14);
-            _buttonSendSynth_14.Click += buttonSendSynth_14_Click;
+            var numberPickerProg_14 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_14);
+            numberPickerProg_14.MinValue = 1;
+            numberPickerProg_14.MaxValue = 128;
+            var numberPickerPan_14 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_14);
+            numberPickerPan_14.MinValue = 1;
+            numberPickerPan_14.MaxValue = 128;
+            numberPickerPan_14.Value = 65;
+            var numberPickerVol_14 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_14);
+            numberPickerVol_14.MinValue = 1;
+            numberPickerVol_14.MaxValue = 128;
+            numberPickerVol_14.Value = 104;
+            var buttonSendSynth_14 = FindViewById<Button>(Resource.Id.button_send_synth_14);
+            buttonSendSynth_14.Click += buttonSendSynth_14_Click;
 
             // fader15
-            var _numberPickerProg_15 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_15);
-            _numberPickerProg_15.MinValue = 1;
-            _numberPickerProg_15.MaxValue = 128;
-            var _numberPickerPan_15 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_15);
-            _numberPickerPan_15.MinValue = 1;
-            _numberPickerPan_15.MaxValue = 128;
-            _numberPickerPan_15.Value = 65;
-            var _numberPickerVol_15 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_15);
-            _numberPickerVol_15.MinValue = 1;
-            _numberPickerVol_15.MaxValue = 128;
-            _numberPickerVol_15.Value = 104;
-            var _buttonSendSynth_15 = FindViewById<Button>(Resource.Id.button_send_synth_15);
-            _buttonSendSynth_15.Click += buttonSendSynth_15_Click;
+            var numberPickerProg_15 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_15);
+            numberPickerProg_15.MinValue = 1;
+            numberPickerProg_15.MaxValue = 128;
+            var numberPickerPan_15 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_15);
+            numberPickerPan_15.MinValue = 1;
+            numberPickerPan_15.MaxValue = 128;
+            numberPickerPan_15.Value = 65;
+            var numberPickerVol_15 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_15);
+            numberPickerVol_15.MinValue = 1;
+            numberPickerVol_15.MaxValue = 128;
+            numberPickerVol_15.Value = 104;
+            var buttonSendSynth_15 = FindViewById<Button>(Resource.Id.button_send_synth_15);
+            buttonSendSynth_15.Click += buttonSendSynth_15_Click;
 
             // fader16
-            var _numberPickerProg_16 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_16);
-            _numberPickerProg_16.MinValue = 1;
-            _numberPickerProg_16.MaxValue = 128;
-            var _numberPickerPan_16 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_16);
-            _numberPickerPan_16.MinValue = 1;
-            _numberPickerPan_16.MaxValue = 128;
-            _numberPickerPan_16.Value = 65;
-            var _numberPickerVol_16 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_16);
-            _numberPickerVol_16.MinValue = 1;
-            _numberPickerVol_16.MaxValue = 128;
-            _numberPickerVol_16.Value = 104;
-            var _buttonSendSynth_16 = FindViewById<Button>(Resource.Id.button_send_synth_16);
-            _buttonSendSynth_16.Click += buttonSendSynth_16_Click;
+            var numberPickerProg_16 = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_16);
+            numberPickerProg_16.MinValue = 1;
+            numberPickerProg_16.MaxValue = 128;
+            var numberPickerPan_16 = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_16);
+            numberPickerPan_16.MinValue = 1;
+            numberPickerPan_16.MaxValue = 128;
+            numberPickerPan_16.Value = 65;
+            var numberPickerVol_16 = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_16);
+            numberPickerVol_16.MinValue = 1;
+            numberPickerVol_16.MaxValue = 128;
+            numberPickerVol_16.Value = 104;
+            var buttonSendSynth_16 = FindViewById<Button>(Resource.Id.button_send_synth_16);
+            buttonSendSynth_16.Click += buttonSendSynth_16_Click;
         }
     }
 }
diff --git a/MidiPlayer.Droid/MainActivity.cs b/MidiPlayer.Droid/MainActivity.cs
index 685954b..9e68a7e 100644
--- a/MidiPlayer.Droid/MainActivity.cs
+++ b/MidiPlayer.Droid/MainActivity.cs
@@ -23,17 +23,17 @@ public partial class MainActivity : AppCompatActivity {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Fields [nouns, noun phrases]
 
-        string soundFontPath = "undefined";
+        string _soundFontPath = "undefined";
 
-        string midiFilePath = "undefined";
+        string _midiFilePath = "undefined";
 
-        PlayList playList;
+        PlayList _playList;
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Constructor
 
         public MainActivity() {
-            playList = new PlayList();
+            _playList = new PlayList();
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
@@ -67,12 +67,12 @@ protected override void OnCreate(Bundle savedInstanceState) {
 
             Synth.Ended += () => {
                 Log.Info("Ended called.");
-                if (!playList.Ready) {
+                if (!_playList.Ready) {
                     Synth.Stop();
                     Synth.Start();
                 } else {
                     Synth.Stop();
-                    Synth.MidiFilePath = playList.Next;
+                    Synth.MidiFilePath = _playList.Next;
                     Synth.Start();
                 }
             };
@@ -92,7 +92,7 @@ protected override void OnPause() {
 
         protected override void OnStop() {
             base.OnStop();
-            Conf.Value.PlayList = playList.List;
+            Conf.Value.PlayList = _playList.List;
             Conf.Save();
         }
 
@@ -109,36 +109,36 @@ protected override void OnDestroy() {
         protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data) {
             switch (requestCode) {
                 case (int) Request.SoundFont:
-                    soundFontPath = getActualPathBy(data);
-                    if (!(soundFontPath.Contains(".SF2") || soundFontPath.Contains(".sf2"))) {
+                    _soundFontPath = getActualPathBy(data);
+                    if (!(_soundFontPath.Contains(".SF2") || _soundFontPath.Contains(".sf2"))) {
                         Log.Warn("not a sound font.");
                         break;
                     }
-                    Log.Info($"selected: {soundFontPath}");
-                    Synth.SoundFontPath = soundFontPath;
-                    Env.SoundFontDir = soundFontPath.ToDirectoryName();
-                    Title = $"MidiPlayer: {midiFilePath.ToFileName()} {soundFontPath.ToFileName()}";
+                    Log.Info($"selected: {_soundFontPath}");
+                    Synth.SoundFontPath = _soundFontPath;
+                    Env.SoundFontDir = _soundFontPath.ToDirectoryName();
+                    Title = $"MidiPlayer: {this._midiFilePath.ToFileName()} {_soundFontPath.ToFileName()}";
                     break;
                 case (int) Request.MidiFile:
-                    midiFilePath = getActualPathBy(data);
-                    if (!(midiFilePath.Contains(".MID") || midiFilePath.Contains(".mid"))) {
+                    this._midiFilePath = getActualPathBy(data);
+                    if (!(this._midiFilePath.Contains(".MID") || this._midiFilePath.Contains(".mid"))) {
                         Log.Warn("not a midi file.");
                         break;
                     }
-                    Log.Info($"selected: {midiFilePath}");
-                    Synth.MidiFilePath = midiFilePath;
-                    Env.MidiFileDir = midiFilePath.ToDirectoryName();
-                    Title = $"MidiPlayer: {midiFilePath.ToFileName()} {soundFontPath.ToFileName()}";
+                    Log.Info($"selected: {this._midiFilePath}");
+                    Synth.MidiFilePath = this._midiFilePath;
+                    Env.MidiFileDir = this._midiFilePath.ToDirectoryName();
+                    Title = $"MidiPlayer: {this._midiFilePath.ToFileName()} {_soundFontPath.ToFileName()}";
                     break;
                 case (int) Request.AddPlayList:
-                    var _midiFilePath = getActualPathBy(data);
-                    if (!(_midiFilePath.Contains(".MID") || _midiFilePath.Contains(".mid"))) {
+                    var midiFilePath = getActualPathBy(data);
+                    if (!(midiFilePath.Contains(".MID") || midiFilePath.Contains(".mid"))) {
                         Log.Warn("not a midi file.");
                         break;
                     }
-                    Log.Info($"selected: {_midiFilePath}");
-                    playList.Add(_midiFilePath); // add to playlist
-                    Env.MidiFileDir = _midiFilePath.ToDirectoryName();
+                    Log.Info($"selected: {midiFilePath}");
+                    _playList.Add(midiFilePath); // add to playlist
+                    Env.MidiFileDir = midiFilePath.ToDirectoryName();
                     break;
                 default:
                     break;
@@ -172,7 +172,7 @@ void buttonLoadMidiFile_Click(object sender, EventArgs e) {
         void buttonStart_Click(object sender, EventArgs e) {
             Log.Info("buttonStart clicked.");
             try {
-                if (!midiFilePath.HasValue()) {
+                if (!_midiFilePath.HasValue()) {
                     return;
                 }
                 playSong();
@@ -202,7 +202,7 @@ void buttonAddPlaylist_Click(object sender, EventArgs e) {
         void buttonDeletePlaylist_Click(object sender, EventArgs e) {
             Log.Info("buttonDeletePlaylist clicked.");
             try {
-                playList.Clear();
+                _playList.Clear();
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -211,12 +211,12 @@ void buttonDeletePlaylist_Click(object sender, EventArgs e) {
         void buttonSendSynth_1_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_1 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_1).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_1).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_1).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch1, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch1, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -225,12 +225,12 @@ void buttonSendSynth_1_Click(object sender, EventArgs e) {
         void buttonSendSynth_2_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_2 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_2).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_2).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_2).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch2, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch2, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -239,12 +239,12 @@ void buttonSendSynth_2_Click(object sender, EventArgs e) {
         void buttonSendSynth_3_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_3 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_3).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_3).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_3).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch3, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch3, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -253,12 +253,12 @@ void buttonSendSynth_3_Click(object sender, EventArgs e) {
         void buttonSendSynth_4_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_4 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_4).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_4).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_4).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch4, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch4, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -267,12 +267,12 @@ void buttonSendSynth_4_Click(object sender, EventArgs e) {
         void buttonSendSynth_5_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_5 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_5).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_5).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_5).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch5, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch5, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -281,12 +281,12 @@ void buttonSendSynth_5_Click(object sender, EventArgs e) {
         void buttonSendSynth_6_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_6 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_6).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_6).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_6).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch6, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch6, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -295,12 +295,12 @@ void buttonSendSynth_6_Click(object sender, EventArgs e) {
         void buttonSendSynth_7_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_7 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_7).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_7).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_7).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch7, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch7, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -309,12 +309,12 @@ void buttonSendSynth_7_Click(object sender, EventArgs e) {
         void buttonSendSynth_8_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_8 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_8).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_8).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_8).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch8, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch8, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -323,12 +323,12 @@ void buttonSendSynth_8_Click(object sender, EventArgs e) {
         void buttonSendSynth_9_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_9 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_9).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_9).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_9).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch9, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch9, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -337,12 +337,12 @@ void buttonSendSynth_9_Click(object sender, EventArgs e) {
         void buttonSendSynth_10_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_10 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_10).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_10).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_10).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch10, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch10, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -351,12 +351,12 @@ void buttonSendSynth_10_Click(object sender, EventArgs e) {
         void buttonSendSynth_11_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_11 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_11).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_11).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_11).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch11, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch11, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -365,12 +365,12 @@ void buttonSendSynth_11_Click(object sender, EventArgs e) {
         void buttonSendSynth_12_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_12 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_12).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_12).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_12).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch12, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch12, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -379,12 +379,12 @@ void buttonSendSynth_12_Click(object sender, EventArgs e) {
         void buttonSendSynth_13_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_13 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_13).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_13).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_13).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch13, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch13, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -393,12 +393,12 @@ void buttonSendSynth_13_Click(object sender, EventArgs e) {
         void buttonSendSynth_14_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_14 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_14).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_14).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_14).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch14, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch14, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -407,12 +407,12 @@ void buttonSendSynth_14_Click(object sender, EventArgs e) {
         void buttonSendSynth_15_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_15 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_15).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_15).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_15).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch15, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch15, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -421,12 +421,12 @@ void buttonSendSynth_15_Click(object sender, EventArgs e) {
         void buttonSendSynth_16_Click(object sender, EventArgs e) {
             Log.Info("buttonSendSynth_16 clicked.");
             try {
-                var _data = new Data() {
+                var data = new Data() {
                     Prog = FindViewById<NumberPicker>(Resource.Id.number_picker_prog_16).Value,
                     Pan = FindViewById<NumberPicker>(Resource.Id.number_picker_pan_16).Value,
                     Vol = FindViewById<NumberPicker>(Resource.Id.number_picker_vol_16).Value,
                 };
-                EventQueue.Enqueue((int) MidiChannel.ch16, _data);
+                EventQueue.Enqueue((int) MidiChannel.ch16, data);
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             }
@@ -445,37 +445,37 @@ void requestPermissions() {
         }
 
         void callIntent(string targetDir, int requestCode) {
-            var _intent = new Intent(Intent.ActionOpenDocument);
-            var _uri = Android.Net.Uri.Parse($"content://com.android.externalstorage.documents/document/primary%3A{targetDir}");
-            _intent.SetData(_uri);
-            _intent.SetType("*/*");
-            _intent.PutExtra("android.provider.extra.INITIAL_URI", _uri);
-            _intent.PutExtra("android.content.extra.SHOW_ADVANCED", true);
-            _intent.AddCategory(Intent.CategoryOpenable);
-            StartActivityForResult(_intent, requestCode);
+            var intent = new Intent(Intent.ActionOpenDocument);
+            var uri = Android.Net.Uri.Parse($"content://com.android.externalstorage.documents/document/primary%3A{targetDir}");
+            intent.SetData(uri);
+            intent.SetType("*/*");
+            intent.PutExtra("android.provider.extra.INITIAL_URI", uri);
+            intent.PutExtra("android.content.extra.SHOW_ADVANCED", true);
+            intent.AddCategory(Intent.CategoryOpenable);
+            StartActivityForResult(intent, requestCode);
         }
 
         static string getActualPathBy(Intent data) {
-            var _uri = data.Data;
-            string _docId = DocumentsContract.GetDocumentId(_uri);
-            char[] _charArray = { ':' };
-            string[] _stringArray = _docId.Split(_charArray);
-            string _type = _stringArray[0]; // primary
-            string _path = "";
-            if ("primary".Equals(_type, StringComparison.OrdinalIgnoreCase)) {
-                _path = Android.OS.Environment.ExternalStorageDirectory + "/" + _stringArray[1];
+            var uri = data.Data;
+            string docId = DocumentsContract.GetDocumentId(uri);
+            char[] charArray = { ':' };
+            string[] stringArray = docId.Split(charArray);
+            string type = stringArray[0]; // primary
+            string path = "";
+            if ("primary".Equals(type, StringComparison.OrdinalIgnoreCase)) {
+                path = Android.OS.Environment.ExternalStorageDirectory + "/" + stringArray[1];
             }
-            return _path;
+            return path;
         }
 
         async void playSong() {
             try {
                 await Task.Run(() => {
-                    if (!playList.Ready) {
-                        Synth.MidiFilePath = midiFilePath;
+                    if (!_playList.Ready) {
+                        Synth.MidiFilePath = _midiFilePath;
                         Synth.Start();
                     } else {
-                        Synth.MidiFilePath = playList.Next;
+                        Synth.MidiFilePath = _playList.Next;
                         Synth.Start();
                     }
                 });
@@ -495,12 +495,12 @@ async void stopSong() {
         }
 
         static void logMemoryInto() {
-            var _maxMemory = Java.Lang.Runtime.GetRuntime().MaxMemory();
-            var _freeMemory = Java.Lang.Runtime.GetRuntime().FreeMemory();
-            var _totalMemory = Java.Lang.Runtime.GetRuntime().TotalMemory();
-            Log.Info($"maxMemory: {_maxMemory.ToMegabytes()}MB");
-            Log.Info($"freeMemory: {_freeMemory.ToMegabytes()}MB");
-            Log.Info($"totalMemory: {_totalMemory.ToMegabytes()}MB");
+            var maxMemory = Java.Lang.Runtime.GetRuntime().MaxMemory();
+            var freeMemory = Java.Lang.Runtime.GetRuntime().FreeMemory();
+            var totalMemory = Java.Lang.Runtime.GetRuntime().TotalMemory();
+            Log.Info($"maxMemory: {maxMemory.ToMegabytes()}MB");
+            Log.Info($"freeMemory: {freeMemory.ToMegabytes()}MB");
+            Log.Info($"totalMemory: {totalMemory.ToMegabytes()}MB");
             // TODO: Mono runtime.
         }
     }
diff --git a/MidiPlayer.FluidSynth/Synth.cs b/MidiPlayer.FluidSynth/Synth.cs
index de46b37..a4c0a93 100644
--- a/MidiPlayer.FluidSynth/Synth.cs
+++ b/MidiPlayer.FluidSynth/Synth.cs
@@ -22,66 +22,66 @@ public class Synth {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // static Fields [nouns, noun phrases]
 
-        static fluid_settings_t setting = IntPtr.Zero;
+        static fluid_settings_t _setting = IntPtr.Zero;
 
-        static fluid_synth_t synth = IntPtr.Zero;
+        static fluid_synth_t _synth = IntPtr.Zero;
 
-        static fluid_player_t player = IntPtr.Zero;
+        static fluid_player_t _player = IntPtr.Zero;
 
-        static fluid_audio_driver_t adriver = IntPtr.Zero;
+        static fluid_audio_driver_t _adriver = IntPtr.Zero;
 
-        static handle_midi_event_func_t event_callback;
+        static handle_midi_event_func_t _event_callback;
 
-        static Func<IntPtr, IntPtr, int> onPlaybacking;
+        static Func<IntPtr, IntPtr, int> _onPlaybacking;
 
-        static Action onStarted;
+        static Action _onStarted;
 
-        static Action onEnded;
+        static Action _onEnded;
 
-        static Action<object, PropertyChangedEventArgs> onUpdated;
+        static Action<object, PropertyChangedEventArgs> _onUpdated;
 
-        static string soundFontPath;
+        static string _soundFontPath;
 
-        static string midiFilePath;
+        static string _midiFilePath;
 
-        static SoundFontInfo soundFontInfo;
+        static SoundFontInfo _soundFontInfo;
 
-        static StandardMidiFile standardMidiFile;
+        static StandardMidiFile _standardMidiFile;
 
-        static bool ready = false;
+        static bool _ready = false;
 
-        static bool stopping = false;
+        static bool _stopping = false;
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // static Constructor
 
         static Synth() {
-            onPlaybacking += (void_ptr data, fluid_midi_event_t evt) => {
+            _onPlaybacking += (void_ptr data, fluid_midi_event_t evt) => {
                 Enumerable.Range(0, 16).ToList().ForEach(x => {
-                    var _data = EventQueue.Dequeue(x);
-                    if (!(_data is null)) {
-                        fluid_synth_program_change(synth, x, _data.Prog);
-                        fluid_synth_cc(synth, x, (int) ControlChange.Pan, _data.Pan);
-                        fluid_synth_cc(synth, x, (int) ControlChange.Volume, _data.Vol);
+                    var eventData = EventQueue.Dequeue(x);
+                    if (!(eventData is null)) {
+                        fluid_synth_program_change(_synth, x, eventData.Prog);
+                        fluid_synth_cc(_synth, x, (int) ControlChange.Pan, eventData.Pan);
+                        fluid_synth_cc(_synth, x, (int) ControlChange.Volume, eventData.Vol);
                     }
                 });
-                var _type = fluid_midi_event_get_type(evt);
-                var _channel = fluid_midi_event_get_channel(evt);
-                var _control = fluid_midi_event_get_control(evt);
-                var _value = fluid_midi_event_get_value(evt);
-                var _program = fluid_midi_event_get_program(evt);
-                if (_type != 128 && _type != 144) { // not note on or note off
-                    Log.Info($"_type: {_type} _channel: {_channel} _control: {_control} _value: {_value} _program: {_program}");
+                var type = fluid_midi_event_get_type(evt);
+                var channel = fluid_midi_event_get_channel(evt);
+                var control = fluid_midi_event_get_control(evt);
+                var value = fluid_midi_event_get_value(evt);
+                var program = fluid_midi_event_get_program(evt);
+                if (type != 128 && type != 144) { // not note on or note off
+                    Log.Info($"_type: {type} _channel: {channel} _control: {control} _value: {value} _program: {program}");
                 }
                 Task.Run(() => {
-                    if (_type == 144) { // NOTE_ON = 144
-                        Multi.ApplyNoteOn(_channel);
-                    } else if (_type == 128) { // NOTE_OFF = 128
-                        Multi.ApplyNoteOff(_channel);
-                    } else if (_type == 192) { // PROGRAM_CHANGE = 192
-                        Multi.ApplyProgramChange(_channel, _program);
-                    } else if (_type == 176) { // CONTROL_CHANGE = 176
-                        Multi.ApplyControlChange(_channel, _control, _value);
+                    if (type == 144) { // NOTE_ON = 144
+                        Multi.ApplyNoteOn(channel);
+                    } else if (type == 128) { // NOTE_OFF = 128
+                        Multi.ApplyNoteOff(channel);
+                    } else if (type == 192) { // PROGRAM_CHANGE = 192
+                        Multi.ApplyProgramChange(channel, program);
+                    } else if (type == 176) { // CONTROL_CHANGE = 176
+                        Multi.ApplyControlChange(channel, control, value);
                     }
                 });
                 return fluid_synth_handle_midi_event(data, evt);
@@ -92,31 +92,31 @@ static Synth() {
         // static Properties [noun, noun phrase, adjective] 
 
         public static string SoundFontPath {
-            get => soundFontPath;
+            get => _soundFontPath;
             set {
-                soundFontPath = value;
-                soundFontInfo = new SoundFontInfo(soundFontPath);
+                _soundFontPath = value;
+                _soundFontInfo = new SoundFontInfo(_soundFontPath);
             }
         }
 
         public static string MidiFilePath {
-            get => midiFilePath;
+            get => _midiFilePath;
             set {
-                midiFilePath = value;
-                standardMidiFile = new StandardMidiFile(midiFilePath);
+                _midiFilePath = value;
+                _standardMidiFile = new StandardMidiFile(_midiFilePath);
             }
         }
 
         public static List<int> MidiChannelList {
-            get => standardMidiFile.MidiChannelList;
+            get => _standardMidiFile.MidiChannelList;
         }
 
         public static int TrackCount {
-            get => standardMidiFile.TrackCount;
+            get => _standardMidiFile.TrackCount;
         }
 
         public static bool Playing {
-            get => ready;
+            get => _ready;
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
@@ -124,25 +124,25 @@ public static bool Playing {
 
         public static event Func<IntPtr, IntPtr, int> Playbacking {
             add {
-                onPlaybacking += value;
-                event_callback = new handle_midi_event_func_t(onPlaybacking);
+                _onPlaybacking += value;
+                _event_callback = new handle_midi_event_func_t(_onPlaybacking);
             }
-            remove => onPlaybacking -= value;
+            remove => _onPlaybacking -= value;
         }
 
         public static event Action Started {
-            add => onStarted += value;
-            remove => onStarted -= value;
+            add => _onStarted += value;
+            remove => _onStarted -= value;
         }
 
         public static event Action Ended {
-            add => onEnded += value;
-            remove => onEnded -= value;
+            add => _onEnded += value;
+            remove => _onEnded -= value;
         }
 
         public static event Action<object, PropertyChangedEventArgs> Updated {
-            add => onUpdated += value;
-            remove => onUpdated -= value;
+            add => _onUpdated += value;
+            remove => _onUpdated -= value;
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
@@ -154,17 +154,17 @@ public static void Init() {
                     Log.Warn("no sound font or no midi file.");
                     return;
                 }
-                setting = new_fluid_settings();
-                synth = new_fluid_synth(setting);
-                player = new_fluid_player(synth);
+                _setting = new_fluid_settings();
+                _synth = new_fluid_synth(_setting);
+                _player = new_fluid_player(_synth);
                 Log.Info($"try to load the sound font: {SoundFontPath}");
                 if (fluid_is_soundfont(SoundFontPath) != 1) {
                     Log.Error("not a sound font.");
                     return;
                 }
-                fluid_player_set_playback_callback(player, event_callback, synth);
-                int _sfont_id = fluid_synth_sfload(synth, SoundFontPath, true);
-                if (_sfont_id == FLUID_FAILED) {
+                fluid_player_set_playback_callback(_player, _event_callback, _synth);
+                int sfont_id = fluid_synth_sfload(_synth, SoundFontPath, true);
+                if (sfont_id == FLUID_FAILED) {
                     Log.Error("failed to load the sound font.");
                     return;
                 } else {
@@ -175,18 +175,18 @@ public static void Init() {
                     Log.Error("not a midi file.");
                     return;
                 }
-                Multi.StandardMidiFile = standardMidiFile;
+                Multi.StandardMidiFile = _standardMidiFile;
                 Enumerable.Range(0, 16).ToList().ForEach(x => {
                     Multi.Get(x).PropertyChanged += onPropertyChanged;
                 });
-                int _result = fluid_player_add(player, MidiFilePath);
-                if (_result == FLUID_FAILED) {
+                int result = fluid_player_add(_player, MidiFilePath);
+                if (result == FLUID_FAILED) {
                     Log.Error("failed to load the midi file.");
                     return;
                 } else {
                     Log.Info($"loaded the midi file: {MidiFilePath}");
                 }
-                ready = true;
+                _ready = true;
                 Log.Info("init :)");
             } catch (Exception ex) {
                 Log.Error(ex.Message);
@@ -195,21 +195,21 @@ public static void Init() {
 
         public static void Start() {
             try {
-                if (!ready) {
+                if (!_ready) {
                     Init();
-                    if (!ready) {
+                    if (!_ready) {
                         Log.Error("failed to init.");
                         return;
                     }
                 }
-                adriver = new_fluid_audio_driver(setting, synth);
-                fluid_player_play(player);
+                _adriver = new_fluid_audio_driver(_setting, _synth);
+                fluid_player_play(_player);
                 Log.Info("start :)");
-                onStarted();
-                fluid_player_join(player);
+                _onStarted();
+                fluid_player_join(_player);
                 Log.Info("end :D");
-                if (stopping == false) {
-                    onEnded();
+                if (_stopping == false) {
+                    _onEnded();
                 }
             } catch (Exception ex) {
                 Log.Error(ex.Message);
@@ -218,9 +218,9 @@ public static void Start() {
 
         public static void Stop() {
             try {
-                if (!player.IsZero()) {
-                    stopping = true;
-                    fluid_player_stop(player);
+                if (!_player.IsZero()) {
+                    _stopping = true;
+                    fluid_player_stop(_player);
                 }
                 final();
                 Log.Info("stop :|");
@@ -234,38 +234,38 @@ public static int HandleEvent(IntPtr data, IntPtr evt) {
         }
 
         public static int GetChannel(IntPtr evt) {
-            var _channel = fluid_midi_event_get_channel(evt);
-            return _channel;
+            var channel = fluid_midi_event_get_channel(evt);
+            return channel;
         }
 
         public static int GetChannel(int track) {
-            var _channel = Multi.Get(track).Channel;
-            return _channel;
+            var channel = Multi.Get(track).Channel;
+            return channel;
         }
 
         public static int GetBank(int track) {
-            var _bank = Multi.Get(track).Bank;
-            if (_bank == -1) { // unset BANK_SELECT_LSB = 32
-                _bank = 0;
+            var bank = Multi.Get(track).Bank;
+            if (bank == -1) { // unset BANK_SELECT_LSB = 32
+                bank = 0;
             }
-            return _bank;
+            return bank;
         }
 
         public static int GetProgram(int track) {
-            var _program = Multi.Get(track).Program;
-            return _program;
+            var program = Multi.Get(track).Program;
+            return program;
         }
 
         public static string GetVoice(int track) {
-            var _bank = GetBank(track);
-            var _program = GetProgram(track);
-            var _voice = soundFontInfo.GetVoice(_bank, _program); 
-            return _voice;
+            var bank = GetBank(track);
+            var program = GetProgram(track);
+            var voice = _soundFontInfo.GetVoice(bank, program); 
+            return voice;
         }
 
         public static string GetTrackName(int track) {
-            var _name = Multi.Get(track).Name;
-            return _name;
+            var name = Multi.Get(track).Name;
+            return name;
         }
 
         public static bool IsSounded(int channel) {
@@ -277,25 +277,25 @@ public static bool IsSounded(int channel) {
 
         static void final() {
             try {
-                delete_fluid_audio_driver(adriver);
-                delete_fluid_player(player);
-                delete_fluid_synth(synth);
-                delete_fluid_settings(setting);
-                adriver = IntPtr.Zero;
-                player = IntPtr.Zero;
-                synth = IntPtr.Zero;
-                setting = IntPtr.Zero;
+                delete_fluid_audio_driver(_adriver);
+                delete_fluid_player(_player);
+                delete_fluid_synth(_synth);
+                delete_fluid_settings(_setting);
+                _adriver = IntPtr.Zero;
+                _player = IntPtr.Zero;
+                _synth = IntPtr.Zero;
+                _setting = IntPtr.Zero;
                 Log.Info("final :|");
             } catch (Exception ex) {
                 Log.Error(ex.Message);
             } finally {
-                ready = false;
-                stopping = false;
+                _ready = false;
+                _stopping = false;
             }
         }
 
         static void onPropertyChanged(object sender, PropertyChangedEventArgs e) {
-            onUpdated(sender, e);
+            _onUpdated(sender, e);
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
@@ -306,28 +306,28 @@ static class Multi {
             ///////////////////////////////////////////////////////////////////////////////////////////
             // static Fields [nouns, noun phrases]
 
-            static Map<int, Track> trackMap;
+            static Map<int, Track> _trackMap;
 
-            static StandardMidiFile standardMidiFile;
+            static StandardMidiFile _standardMidiFile;
 
             ///////////////////////////////////////////////////////////////////////////////////////////
             // static Constructor
 
             static Multi() {
-                trackMap = new Map<int, Track>();
+                _trackMap = new Map<int, Track>();
             }
 
             ///////////////////////////////////////////////////////////////////////////////////////////
             // static Properties [noun, noun phrase, adjective]
 
             public static List<Track> List {
-                get => trackMap.Select(x => x.Value).ToList();
+                get => _trackMap.Select(x => x.Value).ToList();
             }
 
             public static StandardMidiFile StandardMidiFile {
-                get => standardMidiFile;
+                get => _standardMidiFile;
                 set {
-                    standardMidiFile = value;
+                    _standardMidiFile = value;
                     init();
                 }
             }
@@ -339,21 +339,21 @@ public static StandardMidiFile StandardMidiFile {
             /// NOTE_ON = 144
             /// </summary>
             public static void ApplyNoteOn(int channel) {
-                trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Sounds = true);
+                _trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Sounds = true);
             }
 
             /// <summary>
             /// NOTE_OFF = 128
             /// </summary>
             public static void ApplyNoteOff(int channel) {
-                trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Sounds = false);
+                _trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Sounds = false);
             }
 
             /// <summary>
             /// PROGRAM_CHANGE = 192
             /// </summary>
             public static void ApplyProgramChange(int channel, int program) {
-                trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Program = program);
+                _trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Program = program);
             }
 
             /// <summary>
@@ -371,12 +371,12 @@ public static void ApplyControlChange(int channel, int control, int value) {
                 switch (control) {
                     case 0: // BANK_SELECT_MSB
                         if (channel == 9) { // Drum
-                            trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Bank = value + 1); // 128
+                            _trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Bank = value + 1); // 128
                         }
                         break;
                     case 32: // BANK_SELECT_LSB
                         if (channel != 9) { // not Drum
-                            trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Bank = value);
+                            _trackMap.Where(x => x.Value.Channel == channel).ToList().ForEach(x => x.Value.Bank = value);
                         }
                         break;
                     case 7: // VOLUME_MSB
@@ -388,22 +388,22 @@ public static void ApplyControlChange(int channel, int control, int value) {
                 }
             }
 
-            public static Track Get(int track) {
-                var _track = trackMap[track];
-                return _track;
+            public static Track Get(int index) {
+                var track = _trackMap[index];
+                return track;
             }
 
             ///////////////////////////////////////////////////////////////////////////////////////////
             // private static Methods [verb, verb phrases]
 
             static void init() {
-                trackMap.Clear();
-                Enumerable.Range(0, 16).ToList().ForEach(x => trackMap.Add(x, new Track(x)));
-                var _list = standardMidiFile.MidiChannelList;
-                trackMap[0].Name = standardMidiFile.GetTrackName(0);
-                for (var _idx = 0; _idx < MidiChannelList.Count; _idx++) {
-                    trackMap[_idx + 1].Channel = _list[_idx]; // exclude conductor track;
-                    trackMap[_idx + 1].Name = standardMidiFile.GetTrackName(_idx + 1);
+                _trackMap.Clear();
+                Enumerable.Range(0, 16).ToList().ForEach(x => _trackMap.Add(x, new Track(x)));
+                var list = _standardMidiFile.MidiChannelList;
+                _trackMap[0].Name = _standardMidiFile.GetTrackName(0);
+                for (var idx = 0; idx < MidiChannelList.Count; idx++) {
+                    _trackMap[idx + 1].Channel = list[idx]; // exclude conductor track;
+                    _trackMap[idx + 1].Name = _standardMidiFile.GetTrackName(idx + 1);
                 }
             }
         }
@@ -413,23 +413,23 @@ public class Track : INotifyPropertyChanged {
             ///////////////////////////////////////////////////////////////////////////////////////////
             // Fields [nouns, noun phrases]
 
-            int index = -1;
+            int _index = -1;
 
-            bool sounds = false;
+            bool _sounds = false;
 
-            string name = "undefined";
+            string _name = "undefined";
 
-            int channel = -1;
+            int _channel = -1;
 
-            int bank = 0;
+            int _bank = 0;
 
-            int program = 0;
+            int _program = 0;
 
             ///////////////////////////////////////////////////////////////////////////////////////////
             // Constructor
 
             public Track(int index) {
-                this.index = index;
+                _index = index;
             }
 
             ///////////////////////////////////////////////////////////////////////////////////////////
@@ -444,54 +444,54 @@ public Track(int index) {
             // Properties [noun, noun phrase, adjective]
 
             public int Index {
-                get => index;
+                get => _index;
                 set {
-                    index = value;
+                    _index = value;
                     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Index)));
                 }
             }
 
             public bool Sounds {
-                get => sounds;
+                get => _sounds;
                 set {
-                    sounds = value;
+                    _sounds = value;
                     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Sounds)));
                 }
             }
 
             public string Name {
-                get => name;
+                get => _name;
                 set {
-                    name = value;
+                    _name = value;
                     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Name)));
                 }
             }
 
             public int Channel {
-                get => channel;
+                get => _channel;
                 set {
-                    channel = value;
+                    _channel = value;
                     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Channel)));
                 }
             }
 
             public int Bank {
                 get {
-                    if (channel == 9 && bank != 128) {
+                    if (_channel == 9 && _bank != 128) {
                         return 128; // Drum
                     }
-                    return bank;
+                    return _bank;
                 }
                 set {
-                    bank = value;
+                    _bank = value;
                     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Bank)));
                 }
             }
 
             public int Program {
-                get => program;
+                get => _program;
                 set {
-                    program = value;
+                    _program = value;
                     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Program)));
                 }
             }
diff --git a/MidiPlayer.Midi/StandardMidiFile.cs b/MidiPlayer.Midi/StandardMidiFile.cs
index ad8e12d..6fbcb99 100644
--- a/MidiPlayer.Midi/StandardMidiFile.cs
+++ b/MidiPlayer.Midi/StandardMidiFile.cs
@@ -13,27 +13,27 @@ public class StandardMidiFile {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Fields [nouns, noun phrases]
 
-        Sequence sequence;
+        Sequence _sequence;
 
-        Map<int, (string name, int channel)> nameAndMidiChannelMap;
+        Map<int, (string name, int channel)> _nameAndMidiChannelMap;
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Constructor
 
         public StandardMidiFile(string target) {
-            sequence = new Sequence();
-            sequence.Format = 1;
-            sequence.Load(target);
-            Map<int, (string name, int channel)> _nameAndMidiChannelMap;
-            _nameAndMidiChannelMap = new Map<int, (string name, int channel)>();
-            Enumerable.Range(0, sequence.Count).ToList().ForEach(x => {
-                _nameAndMidiChannelMap.Add(x, getTrackNameAndMidiChannel(x));
-            });
+            _sequence = new Sequence();
+            _sequence.Format = 1;
+            _sequence.Load(target);
+            Map<int, (string name, int channel)> nameAndMidiChannelMap;
             nameAndMidiChannelMap = new Map<int, (string name, int channel)>();
-            var _idx = 0;
-            _nameAndMidiChannelMap.ToList().ForEach(x => {
+            Enumerable.Range(0, _sequence.Count).ToList().ForEach(x => {
+                nameAndMidiChannelMap.Add(x, getTrackNameAndMidiChannel(x));
+            });
+            this._nameAndMidiChannelMap = new Map<int, (string name, int channel)>();
+            var idx = 0;
+            nameAndMidiChannelMap.ToList().ForEach(x => {
                 if (!x.Value.name.Equals("System Setup") && !(x.Value.name.Equals("") && x.Value.channel == -1)) { // no need track
-                    nameAndMidiChannelMap.Add(_idx++, x.Value);
+                    this._nameAndMidiChannelMap.Add(idx++, x.Value);
                 }
             });
         }
@@ -42,59 +42,59 @@ public StandardMidiFile(string target) {
         // Properties [noun, noun phrase, adjective] 
 
         public int TrackCount {
-            get => nameAndMidiChannelMap.Where(x => x.Value.channel != -1).Count(); // exclude conductor track;
+            get => _nameAndMidiChannelMap.Where(x => x.Value.channel != -1).Count(); // exclude conductor track;
         }
 
         public List<int> MidiChannelList {
-            get => nameAndMidiChannelMap.Where(x => x.Value.channel != -1).Select(x => x.Value.channel).ToList();
+            get => _nameAndMidiChannelMap.Where(x => x.Value.channel != -1).Select(x => x.Value.channel).ToList();
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // public Methods [verb, verb phrases]
 
-        public string GetTrackName(int track) {
-            return nameAndMidiChannelMap[track].name;
+        public string GetTrackName(int trackIndex) {
+            return _nameAndMidiChannelMap[trackIndex].name;
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // private Methods [verb, verb phrases]
 
-        string getTrackName(int track) {
-            var _trackName = "undefined";
-            var _track = sequence[track];
-            for (var _idx = 0; _idx < _track.Count; _idx++) {
-                var _evt = _track.GetMidiEvent(_idx);
-                var _msg = _evt.MidiMessage;
-                if (_msg.MessageType == MessageType.Meta) {
-                    var _metaMsg = (MetaMessage) _msg;
-                    if (_metaMsg.MetaType == MetaType.TrackName) {
-                        var _data = _metaMsg.GetBytes();
-                        var _text = Encoding.UTF8.GetString(_data);
-                        _trackName = _text;
+        string getTrackName(int trackIndex) {
+            var trackName = "undefined";
+            var track = _sequence[trackIndex];
+            for (var idx = 0; idx < track.Count; idx++) {
+                var evt = track.GetMidiEvent(idx);
+                var msg = evt.MidiMessage;
+                if (msg.MessageType == MessageType.Meta) {
+                    var metaMsg = (MetaMessage) msg;
+                    if (metaMsg.MetaType == MetaType.TrackName) {
+                        var data = metaMsg.GetBytes();
+                        var text = Encoding.UTF8.GetString(data);
+                        trackName = text;
                         break;
                     }
                 }
             }
-            return _trackName;
+            return trackName;
         }
 
-        int getMidiChannel(int track) {
-            var _channel = -1; // conductor track gets -1;
-            var _track = sequence[track];
-            for (var _idx = 0; _idx < _track.Count; _idx++) {
-                var _evt = _track.GetMidiEvent(_idx);
-                var _msg = _evt.MidiMessage;
-                if (_msg.MessageType == MessageType.Channel) {
-                    var _chanMsg = (ChannelMessage) _msg;
-                    _channel = _chanMsg.MidiChannel;
+        int getMidiChannel(int trackIndex) {
+            var channel = -1; // conductor track gets -1;
+            var track = _sequence[trackIndex];
+            for (var idx = 0; idx < track.Count; idx++) {
+                var evt = track.GetMidiEvent(idx);
+                var msg = evt.MidiMessage;
+                if (msg.MessageType == MessageType.Channel) {
+                    var chanMsg = (ChannelMessage) msg;
+                    channel = chanMsg.MidiChannel;
                     break;
                 }
             }
-            return _channel;
+            return channel;
         }
 
-        (string name, int channel) getTrackNameAndMidiChannel(int track) {
-            return (getTrackName(track), getMidiChannel(track));
+        (string name, int channel) getTrackNameAndMidiChannel(int trackIndex) {
+            return (getTrackName(trackIndex), getMidiChannel(trackIndex));
         }
     }
 }
diff --git a/MidiPlayer.SoundFont/SoundFont .cs b/MidiPlayer.SoundFont/SoundFont .cs
index e56383c..318e874 100644
--- a/MidiPlayer.SoundFont/SoundFont .cs	
+++ b/MidiPlayer.SoundFont/SoundFont .cs	
@@ -12,29 +12,29 @@ public class SoundFontInfo {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Fields [nouns, noun phrases]
 
-        NAudio.SoundFont.SoundFont soundFont;
+        NAudio.SoundFont.SoundFont _soundFont;
 
-        Map<int, List<Voice>> map;
+        Map<int, List<Voice>> _map;
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Constructor
 
         public SoundFontInfo(string target) {
             try {
-                soundFont = new NAudio.SoundFont.SoundFont(target);
-                var _map = new Map<int, List<Voice>>();
-                soundFont.Presets.ToList().ForEach(x => {
-                    if (!_map.ContainsKey(x.Bank)) {
-                        var _newList = new List<Voice>();
-                        _newList.Add(new Voice() { Prog = x.PatchNumber, Name = x.Name });
-                        _map.Add(x.Bank, _newList); // new bank and new voice
+                _soundFont = new NAudio.SoundFont.SoundFont(target);
+                var map = new Map<int, List<Voice>>();
+                _soundFont.Presets.ToList().ForEach(x => {
+                    if (!map.ContainsKey(x.Bank)) {
+                        var newList = new List<Voice>();
+                        newList.Add(new Voice() { Prog = x.PatchNumber, Name = x.Name });
+                        map.Add(x.Bank, newList); // new bank and new voice
                     } else {
-                        _map[x.Bank].Add(new Voice() { Prog = x.PatchNumber, Name = x.Name }); // exists bank and new voice
+                        map[x.Bank].Add(new Voice() { Prog = x.PatchNumber, Name = x.Name }); // exists bank and new voice
                     }
                 });
-                map = new Map<int, List<Voice>>();
-                _map.OrderBy(x => x.Key).ToList().ForEach(x => { // sort bank
-                    map.Add(x.Key, x.Value.OrderBy(_x => _x.Prog).ToList()); // sort prog
+                this._map = new Map<int, List<Voice>>();
+                map.OrderBy(x => x.Key).ToList().ForEach(x => { // sort bank
+                    this._map.Add(x.Key, x.Value.OrderBy(_x => _x.Prog).ToList()); // sort prog
                 });
             } catch (Exception ex) {
                 Log.Error(ex.Message);
@@ -45,12 +45,12 @@ public SoundFontInfo(string target) {
         // public Methods [verb, verb phrases]
 
         public string GetVoice(int bank, int prog) {
-            var _voice = map[bank];
-            var _result = _voice.Where(x => x.Prog == prog);
-            if (_result.Count() == 0) {
-                return map[0].Where(x => x.Prog == prog).First().Name; // return default bank's voice.
+            var voice = _map[bank];
+            var result = voice.Where(x => x.Prog == prog);
+            if (result.Count() == 0) {
+                return _map[0].Where(x => x.Prog == prog).First().Name; // return default bank's voice.
             } else {
-                return _voice.Where(x => x.Prog == prog).First().Name;
+                return voice.Where(x => x.Prog == prog).First().Name;
             }
         }
 
diff --git a/MidiPlayer.Win64/MainForm.Designer.cs b/MidiPlayer.Win64/MainForm.Designer.cs
index 41d5907..a717591 100644
--- a/MidiPlayer.Win64/MainForm.Designer.cs
+++ b/MidiPlayer.Win64/MainForm.Designer.cs
@@ -24,81 +24,81 @@ protected override void Dispose(bool disposing) {
         ///  the contents of this method with the code editor.
         /// </summary>
         private void InitializeComponent() {
-            this.buttonLoadSoundFont = new System.Windows.Forms.Button();
-            this.buttonLoadMidiFile = new System.Windows.Forms.Button();
-            this.buttonStart = new System.Windows.Forms.Button();
-            this.buttonStop = new System.Windows.Forms.Button();
-            this.openFileDialog = new System.Windows.Forms.OpenFileDialog();
-            this.listView = new BufferedListView();
+            this._buttonLoadSoundFont = new System.Windows.Forms.Button();
+            this._buttonLoadMidiFile = new System.Windows.Forms.Button();
+            this._buttonStart = new System.Windows.Forms.Button();
+            this._buttonStop = new System.Windows.Forms.Button();
+            this._openFileDialog = new System.Windows.Forms.OpenFileDialog();
+            this._listView = new BufferedListView();
             this.SuspendLayout();
             // 
             // buttonLoadSoundFont
             // 
-            this.buttonLoadSoundFont.Font = new System.Drawing.Font("Yu Gothic UI", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
-            this.buttonLoadSoundFont.Location = new System.Drawing.Point(12, 12);
-            this.buttonLoadSoundFont.Name = "buttonLoadSoundFont";
-            this.buttonLoadSoundFont.Size = new System.Drawing.Size(84, 40);
-            this.buttonLoadSoundFont.TabIndex = 0;
-            this.buttonLoadSoundFont.Text = "SOUND";
-            this.buttonLoadSoundFont.UseVisualStyleBackColor = true;
-            this.buttonLoadSoundFont.Click += new System.EventHandler(this.buttonLoadSoundFont_Click);
+            this._buttonLoadSoundFont.Font = new System.Drawing.Font("Yu Gothic UI", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
+            this._buttonLoadSoundFont.Location = new System.Drawing.Point(12, 12);
+            this._buttonLoadSoundFont.Name = "buttonLoadSoundFont";
+            this._buttonLoadSoundFont.Size = new System.Drawing.Size(84, 40);
+            this._buttonLoadSoundFont.TabIndex = 0;
+            this._buttonLoadSoundFont.Text = "SOUND";
+            this._buttonLoadSoundFont.UseVisualStyleBackColor = true;
+            this._buttonLoadSoundFont.Click += new System.EventHandler(this.buttonLoadSoundFont_Click);
             // 
             // buttonLoadMidiFile
             // 
-            this.buttonLoadMidiFile.Font = new System.Drawing.Font("Yu Gothic UI", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
-            this.buttonLoadMidiFile.Location = new System.Drawing.Point(107, 12);
-            this.buttonLoadMidiFile.Name = "buttonLoadMidiFile";
-            this.buttonLoadMidiFile.Size = new System.Drawing.Size(84, 40);
-            this.buttonLoadMidiFile.TabIndex = 1;
-            this.buttonLoadMidiFile.Text = "SONG";
-            this.buttonLoadMidiFile.UseVisualStyleBackColor = true;
-            this.buttonLoadMidiFile.Click += new System.EventHandler(this.buttonLoadMidiFile_Click);
+            this._buttonLoadMidiFile.Font = new System.Drawing.Font("Yu Gothic UI", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
+            this._buttonLoadMidiFile.Location = new System.Drawing.Point(107, 12);
+            this._buttonLoadMidiFile.Name = "buttonLoadMidiFile";
+            this._buttonLoadMidiFile.Size = new System.Drawing.Size(84, 40);
+            this._buttonLoadMidiFile.TabIndex = 1;
+            this._buttonLoadMidiFile.Text = "SONG";
+            this._buttonLoadMidiFile.UseVisualStyleBackColor = true;
+            this._buttonLoadMidiFile.Click += new System.EventHandler(this.buttonLoadMidiFile_Click);
             // 
             // buttonStart
             // 
-            this.buttonStart.Font = new System.Drawing.Font("Yu Gothic UI", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
-            this.buttonStart.Location = new System.Drawing.Point(202, 12);
-            this.buttonStart.Name = "buttonStart";
-            this.buttonStart.Size = new System.Drawing.Size(84, 40);
-            this.buttonStart.TabIndex = 2;
-            this.buttonStart.Text = "START";
-            this.buttonStart.UseVisualStyleBackColor = true;
-            this.buttonStart.Click += new System.EventHandler(this.buttonStart_Click);
+            this._buttonStart.Font = new System.Drawing.Font("Yu Gothic UI", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
+            this._buttonStart.Location = new System.Drawing.Point(202, 12);
+            this._buttonStart.Name = "buttonStart";
+            this._buttonStart.Size = new System.Drawing.Size(84, 40);
+            this._buttonStart.TabIndex = 2;
+            this._buttonStart.Text = "START";
+            this._buttonStart.UseVisualStyleBackColor = true;
+            this._buttonStart.Click += new System.EventHandler(this.buttonStart_Click);
             // 
             // buttonStop
             // 
-            this.buttonStop.Font = new System.Drawing.Font("Yu Gothic UI", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
-            this.buttonStop.Location = new System.Drawing.Point(297, 12);
-            this.buttonStop.Name = "buttonStop";
-            this.buttonStop.Size = new System.Drawing.Size(84, 40);
-            this.buttonStop.TabIndex = 3;
-            this.buttonStop.Text = "STOP";
-            this.buttonStop.UseVisualStyleBackColor = true;
-            this.buttonStop.Click += new System.EventHandler(this.buttonStop_Click);
+            this._buttonStop.Font = new System.Drawing.Font("Yu Gothic UI", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
+            this._buttonStop.Location = new System.Drawing.Point(297, 12);
+            this._buttonStop.Name = "buttonStop";
+            this._buttonStop.Size = new System.Drawing.Size(84, 40);
+            this._buttonStop.TabIndex = 3;
+            this._buttonStop.Text = "STOP";
+            this._buttonStop.UseVisualStyleBackColor = true;
+            this._buttonStop.Click += new System.EventHandler(this.buttonStop_Click);
             // 
             // openFileDialog
             // 
-            this.openFileDialog.FileName = "openFileDialog";
+            this._openFileDialog.FileName = "openFileDialog";
             // 
             // listView
             // 
-            this.listView.HideSelection = false;
-            this.listView.Location = new System.Drawing.Point(12, 74);
-            this.listView.Name = "listView";
-            this.listView.Size = new System.Drawing.Size(604, 423);
-            this.listView.TabIndex = 4;
-            this.listView.UseCompatibleStateImageBehavior = false;
+            this._listView.HideSelection = false;
+            this._listView.Location = new System.Drawing.Point(12, 74);
+            this._listView.Name = "listView";
+            this._listView.Size = new System.Drawing.Size(604, 423);
+            this._listView.TabIndex = 4;
+            this._listView.UseCompatibleStateImageBehavior = false;
             // 
             // MainForm
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 20F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(628, 508);
-            this.Controls.Add(this.listView);
-            this.Controls.Add(this.buttonStop);
-            this.Controls.Add(this.buttonStart);
-            this.Controls.Add(this.buttonLoadMidiFile);
-            this.Controls.Add(this.buttonLoadSoundFont);
+            this.Controls.Add(this._listView);
+            this.Controls.Add(this._buttonStop);
+            this.Controls.Add(this._buttonStart);
+            this.Controls.Add(this._buttonLoadMidiFile);
+            this.Controls.Add(this._buttonLoadSoundFont);
             this.Name = "MainForm";
             this.Text = "MIDIPlayer";
             this.Load += new System.EventHandler(this.MainForm_Load);
@@ -108,12 +108,12 @@ private void InitializeComponent() {
 
         #endregion
 
-        private System.Windows.Forms.Button buttonLoadSoundFont;
-        private System.Windows.Forms.Button buttonLoadMidiFile;
-        private System.Windows.Forms.Button buttonStart;
-        private System.Windows.Forms.Button buttonStop;
-        private System.Windows.Forms.OpenFileDialog openFileDialog;
-        private System.Windows.Forms.ListView listView;
+        private System.Windows.Forms.Button _buttonLoadSoundFont;
+        private System.Windows.Forms.Button _buttonLoadMidiFile;
+        private System.Windows.Forms.Button _buttonStart;
+        private System.Windows.Forms.Button _buttonStop;
+        private System.Windows.Forms.OpenFileDialog _openFileDialog;
+        private System.Windows.Forms.ListView _listView;
     }
 }
 
diff --git a/MidiPlayer.Win64/MainForm.cs b/MidiPlayer.Win64/MainForm.cs
index 2c03eb4..52e0d52 100644
--- a/MidiPlayer.Win64/MainForm.cs
+++ b/MidiPlayer.Win64/MainForm.cs
@@ -16,11 +16,11 @@ public partial class MainForm : Form {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Fields [nouns, noun phrases]
 
-        string soundFontPath = "undefined";
+        string _soundFontPath = "undefined";
 
-        string midiFilePath = "undefined";
+        string _midiFilePath = "undefined";
 
-        PlayList playList;
+        PlayList _playList;
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Constructor
@@ -28,7 +28,7 @@ public partial class MainForm : Form {
         public MainForm() {
             InitializeComponent();
             DoubleBuffered = true;
-            playList = new PlayList();
+            _playList = new PlayList();
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
@@ -46,28 +46,28 @@ void MainForm_Load(object sender, EventArgs e) {
                 Log.Info("Started called.");
                 Invoke((MethodInvoker) (() => {
                     Text = $"MidiPlayer: {Synth.MidiFilePath.ToFileName()} {Synth.SoundFontPath.ToFileName()}";
-                    listView.Items.Clear();
+                    _listView.Items.Clear();
                     Enumerable.Range(0, Synth.TrackCount).ToList().ForEach(x => {
-                        listView.Items.Add(new ListViewItem(new string[] { "  ●", "--", "--", "--", "--", "--" }));
+                        _listView.Items.Add(new ListViewItem(new string[] { "  ●", "--", "--", "--", "--", "--" }));
                     });
                 }));
             };
 
             Synth.Ended += () => {
                 Log.Info("Ended called.");
-                if (!playList.Ready) {
+                if (!_playList.Ready) {
                     Synth.Stop();
                     Synth.Start();
                 } else {
                     Synth.Stop();
-                    Synth.MidiFilePath = playList.Next;
+                    Synth.MidiFilePath = _playList.Next;
                     Synth.Start();
                 }
             };
 
             Synth.Updated += (object sender, PropertyChangedEventArgs e) => {
-                var _track = (Synth.Track) sender;
-                Invoke(updateList(_track));
+                var track = (Synth.Track) sender;
+                Invoke(updateList(track));
             };
         }
 
@@ -77,10 +77,10 @@ void buttonLoadSoundFont_Click(object sender, EventArgs e) {
                 if (Synth.Playing) {
                     stopSong();
                 }
-                var _dialog = openFileDialog.ShowDialog();
-                if (_dialog == DialogResult.OK) {
-                    soundFontPath = Path.GetFullPath(openFileDialog.FileName);
-                    Synth.SoundFontPath = soundFontPath;
+                var dialog = _openFileDialog.ShowDialog();
+                if (dialog == DialogResult.OK) {
+                    _soundFontPath = Path.GetFullPath(_openFileDialog.FileName);
+                    Synth.SoundFontPath = _soundFontPath;
                 }
             } catch (Exception ex) {
                 Log.Error(ex.Message);
@@ -93,10 +93,10 @@ void buttonLoadMidiFile_Click(object sender, EventArgs e) {
                 if (Synth.Playing) {
                     stopSong();
                 }
-                var _dialog = openFileDialog.ShowDialog();
-                if (_dialog == DialogResult.OK) {
-                    midiFilePath = Path.GetFullPath(openFileDialog.FileName);
-                    Synth.MidiFilePath = midiFilePath;
+                var dialog = _openFileDialog.ShowDialog();
+                if (dialog == DialogResult.OK) {
+                    _midiFilePath = Path.GetFullPath(_openFileDialog.FileName);
+                    Synth.MidiFilePath = _midiFilePath;
                 }
             } catch (Exception ex) {
                 Log.Error(ex.Message);
@@ -106,7 +106,7 @@ void buttonLoadMidiFile_Click(object sender, EventArgs e) {
         void buttonStart_Click(object sender, EventArgs e) {
             Log.Info("buttonStart clicked.");
             try {
-                if (!midiFilePath.HasValue()) {
+                if (!_midiFilePath.HasValue()) {
                     return;
                 }
                 playSong();
@@ -130,11 +130,11 @@ void buttonStop_Click(object sender, EventArgs e) {
         async void playSong() {
             try {
                 await Task.Run(() => {
-                    if (!playList.Ready) {
-                        Synth.MidiFilePath = midiFilePath;
+                    if (!_playList.Ready) {
+                        Synth.MidiFilePath = _midiFilePath;
                         Synth.Start();
                     } else {
-                        Synth.MidiFilePath = playList.Next;
+                        Synth.MidiFilePath = _playList.Next;
                         Synth.Start();
                     }
                 });
@@ -148,7 +148,7 @@ async void stopSong() {
                 await Task.Run(() => Synth.Stop());
                 Invoke((MethodInvoker) (() => {
                     Enumerable.Range(0, Synth.TrackCount).ToList().ForEach(x => {
-                        listView.Items[x].SubItems[0].ForeColor = Color.Black;
+                        _listView.Items[x].SubItems[0].ForeColor = Color.Black;
                     });
                 }));
             } catch (Exception ex) {
@@ -158,9 +158,9 @@ async void stopSong() {
 
         MethodInvoker updateList(Synth.Track track) {
             const int _column1Idx = 0;
-            var _trackIdx = track.Index - 1; // exclude conductor track;
+            var trackIdx = track.Index - 1; // exclude conductor track;
             return () => {
-                var _listViewItem = new ListViewItem(new string[] {
+                var listViewItem = new ListViewItem(new string[] {
                     "  ●",
                     track.Name,
                     Synth.GetVoice(track.Index),
@@ -168,44 +168,44 @@ MethodInvoker updateList(Synth.Track track) {
                     track.Bank.ToString(),
                     track.Program.ToString()
                 });
-                listView.BeginUpdate();
-                listView.Items[_trackIdx] = _listViewItem;
-                listView.Items[_trackIdx].UseItemStyleForSubItems = false;
+                _listView.BeginUpdate();
+                _listView.Items[trackIdx] = listViewItem;
+                _listView.Items[trackIdx].UseItemStyleForSubItems = false;
                 if (track.Sounds) {
-                    listView.Items[_trackIdx].SubItems[_column1Idx].ForeColor = Color.Lime;
+                    _listView.Items[trackIdx].SubItems[_column1Idx].ForeColor = Color.Lime;
                 } else {
-                    listView.Items[_trackIdx].SubItems[_column1Idx].ForeColor = Color.Black;
+                    _listView.Items[trackIdx].SubItems[_column1Idx].ForeColor = Color.Black;
                 }
-                listView.EndUpdate();
+                _listView.EndUpdate();
             };
         }
 
         void initializeControl() {
             // initialize ListView
-            listView.FullRowSelect = true;
-            listView.GridLines = true;
-            listView.Sorting = SortOrder.None; // do not sort automatically.
-            listView.View = View.Details;
-            var _column1 = new ColumnHeader();
-            _column1.Text = "On";
-            _column1.Width = 40;
-            var _column2 = new ColumnHeader();
-            _column2.Text = "Name";
-            _column2.Width = 180;
-            var _column3 = new ColumnHeader();
-            _column3.Text = "Voice";
-            _column3.Width = 180;
-            var _column4 = new ColumnHeader();
-            _column4.Text = "Chan";
-            _column4.Width = 50;
-            var _column5 = new ColumnHeader();
-            _column5.Text = "Bank";
-            _column5.Width = 50;
-            var _column6 = new ColumnHeader();
-            _column6.Text = "Prog";
-            _column6.Width = 50;
-            ColumnHeader[] _columnHeaderArray = { _column1, _column2, _column3, _column4, _column5, _column6 };
-            listView.Columns.AddRange(_columnHeaderArray);
+            _listView.FullRowSelect = true;
+            _listView.GridLines = true;
+            _listView.Sorting = SortOrder.None; // do not sort automatically.
+            _listView.View = View.Details;
+            var column1 = new ColumnHeader();
+            column1.Text = "On";
+            column1.Width = 40;
+            var column2 = new ColumnHeader();
+            column2.Text = "Name";
+            column2.Width = 180;
+            var column3 = new ColumnHeader();
+            column3.Text = "Voice";
+            column3.Width = 180;
+            var column4 = new ColumnHeader();
+            column4.Text = "Chan";
+            column4.Width = 50;
+            var column5 = new ColumnHeader();
+            column5.Text = "Bank";
+            column5.Width = 50;
+            var column6 = new ColumnHeader();
+            column6.Text = "Prog";
+            column6.Width = 50;
+            ColumnHeader[] columnHeaderArray = { column1, column2, column3, column4, column5, column6 };
+            _listView.Columns.AddRange(columnHeaderArray);
         }
     }
 }
diff --git a/MidiPlayer/Conf.cs b/MidiPlayer/Conf.cs
index 20c135c..ea67b83 100644
--- a/MidiPlayer/Conf.cs
+++ b/MidiPlayer/Conf.cs
@@ -15,21 +15,21 @@ public class Conf {
 
         static readonly string APP_CONF_FILE_PATH = "storage/emulated/0/Android/data/com.studio.meowtoon.midiplayer/files/app_conf.json";
 
-        static Json json = null;
+        static Json _json = null;
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // static Properties [noun, noun phrase, adjective] 
 
         public static bool Ready {
-            get => !(json is null);
+            get => !(_json is null);
         }
 
         public static App Value {
             get {
-                if (json is null) {
+                if (_json is null) {
                     return null;
                 }
-                return json.App;
+                return _json.App;
             }
         }
 
@@ -38,24 +38,24 @@ public static App Value {
 
         public static void Load() {
             if (File.Exists(APP_CONF_FILE_PATH)) {
-                using (var _stream = new StreamReader(APP_CONF_FILE_PATH)) {
-                    json = loadJson(_stream.ReadToEnd().ToMemoryStream());
+                using (var stream = new StreamReader(APP_CONF_FILE_PATH)) {
+                    _json = loadJson(stream.ReadToEnd().ToMemoryStream());
                 }
             } else {
-                Synth _synth = new Synth();
-                _synth.SoundFontDir = "undefined";
-                _synth.MidiFileDir = "undefined";
-                App _app = new App();
-                _app.PlayList = null;
-                _app.Synth = _synth;
-                json = new Json();
-                json.App = _app;
+                Synth synth = new Synth();
+                synth.SoundFontDir = "undefined";
+                synth.MidiFileDir = "undefined";
+                App app = new App();
+                app.PlayList = null;
+                app.Synth = synth;
+                _json = new Json();
+                _json.App = app;
             }
         }
 
         public static void Save() {
-            using (var _stream = new FileStream(APP_CONF_FILE_PATH, FileMode.Create, FileAccess.Write)) {
-                saveJson(_stream);
+            using (var stream = new FileStream(APP_CONF_FILE_PATH, FileMode.Create, FileAccess.Write)) {
+                saveJson(stream);
             }
         }
 
@@ -63,14 +63,14 @@ public static void Save() {
         // private static Methods [verb, verb phrases]
 
         static Json loadJson(Stream target) {
-            var _serializer = new DataContractJsonSerializer(typeof(Json));
-            return (Json) _serializer.ReadObject(target);
+            var serializer = new DataContractJsonSerializer(typeof(Json));
+            return (Json) serializer.ReadObject(target);
         }
 
         static void saveJson(Stream target) {
-            using (var _writer = JsonReaderWriterFactory.CreateJsonWriter(target, Encoding.UTF8, true, true)) {
-                var _serializer = new DataContractJsonSerializer(typeof(Json));
-                _serializer.WriteObject(_writer, json);
+            using (var writer = JsonReaderWriterFactory.CreateJsonWriter(target, Encoding.UTF8, true, true)) {
+                var serializer = new DataContractJsonSerializer(typeof(Json));
+                serializer.WriteObject(writer, _json);
             }
         }
 
diff --git a/MidiPlayer/Env.cs b/MidiPlayer/Env.cs
index 2d230d4..6746d81 100644
--- a/MidiPlayer/Env.cs
+++ b/MidiPlayer/Env.cs
@@ -8,9 +8,9 @@ public class Env {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // static Fields [nouns, noun phrases]
 
-        static string soundFontDir = "Music";
+        static string _soundFontDir = "Music";
 
-        static string midiFileDir = "Music";
+        static string _midiFileDir = "Music";
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // static Properties [noun, noun phrase, adjective] 
@@ -18,26 +18,26 @@ public class Env {
         public static string SoundFontDir {
             get {
                 if (!Conf.Value.Synth.SoundFontDir.Equals("undefined")) {
-                    soundFontDir = Conf.Value.Synth.SoundFontDir;
+                    _soundFontDir = Conf.Value.Synth.SoundFontDir;
                 }
-                return soundFontDir.Replace("/", "%2F");
+                return _soundFontDir.Replace("/", "%2F");
             }
             set {
-                soundFontDir = value.Replace("/storage/emulated/0/", "");
-                Conf.Value.Synth.SoundFontDir = soundFontDir;
+                _soundFontDir = value.Replace("/storage/emulated/0/", "");
+                Conf.Value.Synth.SoundFontDir = _soundFontDir;
             }
         }
 
         public static string MidiFileDir {
             get {
                 if (!Conf.Value.Synth.MidiFileDir.Equals("undefined")) {
-                    midiFileDir = Conf.Value.Synth.MidiFileDir;
+                    _midiFileDir = Conf.Value.Synth.MidiFileDir;
                 }
-                return midiFileDir.Replace("/", "%2F");
+                return _midiFileDir.Replace("/", "%2F");
             }
             set {
-                midiFileDir = value.Replace("/storage/emulated/0/", "");
-                Conf.Value.Synth.MidiFileDir = midiFileDir;
+                _midiFileDir = value.Replace("/storage/emulated/0/", "");
+                Conf.Value.Synth.MidiFileDir = _midiFileDir;
             }
         }
     }
diff --git a/MidiPlayer/EventQueue.cs b/MidiPlayer/EventQueue.cs
index 611d830..b790bb7 100644
--- a/MidiPlayer/EventQueue.cs
+++ b/MidiPlayer/EventQueue.cs
@@ -17,25 +17,25 @@ public class EventQueue {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // static Fields [nouns, noun phrases]
 
-        static Map<int, Queue<Data>> queueMap = new Map<int, Queue<Data>>();
+        static Map<int, Queue<Data>> _queueMap = new Map<int, Queue<Data>>();
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // static Constructor
 
         static EventQueue() {
-            queueMap = new Map<int, Queue<Data>>();
-            Enumerable.Range(0, 16).ToList().ForEach(x => queueMap.Add(x, new Queue<Data>()));
+            _queueMap = new Map<int, Queue<Data>>();
+            Enumerable.Range(0, 16).ToList().ForEach(x => _queueMap.Add(x, new Queue<Data>()));
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // public static Methods [verb, verb phrases]
 
         public static void Enqueue(int idx, Data value) {
-            queueMap[idx].Enqueue(value);
+            _queueMap[idx].Enqueue(value);
         }
 
         public static Data Dequeue(int idx) {
-            return queueMap[idx].Count == 0 ? null : queueMap[idx].Dequeue();
+            return _queueMap[idx].Count == 0 ? null : _queueMap[idx].Dequeue();
         }
     }
 
@@ -47,28 +47,28 @@ public class Data {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Properties [noun, noun phrase, adjective] 
 
-        int prog;
+        int _prog;
 
-        int pan;
+        int _pan;
 
-        int vol;
+        int _vol;
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Properties [noun, noun phrase, adjective] 
 
         public int Prog {
-            get => prog - 1;
-            set => prog = value;
+            get => _prog - 1;
+            set => _prog = value;
         }
 
         public int Pan {
-            get => pan - 1;
-            set => pan = value;
+            get => _pan - 1;
+            set => _pan = value;
         }
 
         public int Vol {
-            get => vol - 1;
-            set => vol = value;
+            get => _vol - 1;
+            set => _vol = value;
         }
     }
 }
diff --git a/MidiPlayer/Log.cs b/MidiPlayer/Log.cs
index a87bbae..8680419 100644
--- a/MidiPlayer/Log.cs
+++ b/MidiPlayer/Log.cs
@@ -11,39 +11,39 @@ public static class Log {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // static Fields [nouns, noun phrases]
 
-        static Logger logger = LogManager.GetCurrentClassLogger();
+        static Logger _logger = LogManager.GetCurrentClassLogger();
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // public static Methods [verb, verb phrases]
 
         public static void Fatal(string target) {
-            LogEventInfo _event = new LogEventInfo(LogLevel.Fatal, logger.Name, target);
-            logger.Log(typeof(Log), _event);
+            LogEventInfo eventInfo = new LogEventInfo(LogLevel.Fatal, _logger.Name, target);
+            _logger.Log(typeof(Log), eventInfo);
         }
 
         public static void Error(string target) {
-            LogEventInfo _event = new LogEventInfo(LogLevel.Error, logger.Name, target);
-            logger.Log(typeof(Log), _event);
+            LogEventInfo eventInfo = new LogEventInfo(LogLevel.Error, _logger.Name, target);
+            _logger.Log(typeof(Log), eventInfo);
         }
 
         public static void Warn(string target) {
-            LogEventInfo _event = new LogEventInfo(LogLevel.Warn, logger.Name, target);
-            logger.Log(typeof(Log), _event);
+            LogEventInfo eventInfo = new LogEventInfo(LogLevel.Warn, _logger.Name, target);
+            _logger.Log(typeof(Log), eventInfo);
         }
 
         public static void Info(string target) {
-            LogEventInfo _event = new LogEventInfo(LogLevel.Info, logger.Name, target);
-            logger.Log(typeof(Log), _event);
+            LogEventInfo eventInfo = new LogEventInfo(LogLevel.Info, _logger.Name, target);
+            _logger.Log(typeof(Log), eventInfo);
         }
 
         public static void Debug(string target) {
-            LogEventInfo _event = new LogEventInfo(LogLevel.Debug, logger.Name, target);
-            logger.Log(typeof(Log), _event);
+            LogEventInfo eventInfo = new LogEventInfo(LogLevel.Debug, _logger.Name, target);
+            _logger.Log(typeof(Log), eventInfo);
         }
 
         public static void Trace(string target) {
-            LogEventInfo _event = new LogEventInfo(LogLevel.Trace, logger.Name, target);
-            logger.Log(typeof(Log), _event);
+            LogEventInfo eventInfo = new LogEventInfo(LogLevel.Trace, _logger.Name, target);
+            _logger.Log(typeof(Log), eventInfo);
         }
     }
 }
\ No newline at end of file
diff --git a/MidiPlayer/PlayList.cs b/MidiPlayer/PlayList.cs
index 82c1b09..44c5d06 100644
--- a/MidiPlayer/PlayList.cs
+++ b/MidiPlayer/PlayList.cs
@@ -10,38 +10,38 @@ public class PlayList {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Fields [nouns, noun phrases]
 
-        List<string> targetList = new List<string>();
+        List<string> _targetList = new List<string>();
 
-        int idx;
+        int _idx;
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Constructor
 
         public PlayList() {
-            idx = 0;
+            _idx = 0;
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Properties [noun, noun phrase, adjective] 
 
         public bool Ready {
-            get => targetList.Count == 0 ? false : true;
+            get => _targetList.Count == 0 ? false : true;
         }
 
         public string[] List {
-            get => targetList.ToArray();
+            get => _targetList.ToArray();
         }
 
         public string Current {
-            get => targetList[idx];
+            get => _targetList[_idx];
         }
 
         public string Next {
             get {
-                if (idx == targetList.Count) {
-                    idx = 0;
+                if (_idx == _targetList.Count) {
+                    _idx = 0;
                 }
-                return targetList[idx++];
+                return _targetList[_idx++];
             }
         }
 
@@ -49,11 +49,11 @@ public string Next {
         // public Methods [verb, verb phrases]
 
         public void Add(string target) {
-            targetList.Add(target);
+            _targetList.Add(target);
         }
 
         public void Clear() {
-            targetList.Clear();
+            _targetList.Clear();
         }
     }
 }
diff --git a/MidiPlayerTests/PlayListTests.cs b/MidiPlayerTests/PlayListTests.cs
index 7fab130..d422802 100644
--- a/MidiPlayerTests/PlayListTests.cs
+++ b/MidiPlayerTests/PlayListTests.cs
@@ -7,22 +7,22 @@ namespace MidiPlayer.Test {
     public class PlayListTests {
         [TestMethod()]
         public void NextTest1() {
-            var _target = new PlayList();
-            _target.Add("file1.mid");
-            _target.Add("file2.mid");
-            _target.Add("file3.mid");
-            AreEqual("file1.mid", _target.Next);
-            AreEqual("file2.mid", _target.Next);
-            AreEqual("file3.mid", _target.Next);
-            AreEqual("file1.mid", _target.Next);
-            AreEqual("file2.mid", _target.Next);
-            _target.Add("file4.mid");
-            AreEqual("file3.mid", _target.Next);
-            AreEqual("file4.mid", _target.Next);
-            AreEqual("file1.mid", _target.Next);
-            AreEqual("file2.mid", _target.Next);
-            AreEqual("file3.mid", _target.Next);
-            AreEqual("file4.mid", _target.Next);
+            var target = new PlayList();
+            target.Add("file1.mid");
+            target.Add("file2.mid");
+            target.Add("file3.mid");
+            AreEqual("file1.mid", target.Next);
+            AreEqual("file2.mid", target.Next);
+            AreEqual("file3.mid", target.Next);
+            AreEqual("file1.mid", target.Next);
+            AreEqual("file2.mid", target.Next);
+            target.Add("file4.mid");
+            AreEqual("file3.mid", target.Next);
+            AreEqual("file4.mid", target.Next);
+            AreEqual("file1.mid", target.Next);
+            AreEqual("file2.mid", target.Next);
+            AreEqual("file3.mid", target.Next);
+            AreEqual("file4.mid", target.Next);
         }
     }
 }
diff --git a/MidiPlayerTests/PrivateObject.cs b/MidiPlayerTests/PrivateObject.cs
index 9106eaf..b12f906 100644
--- a/MidiPlayerTests/PrivateObject.cs
+++ b/MidiPlayerTests/PrivateObject.cs
@@ -11,33 +11,33 @@ public class PrivateObject {
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Fields [nouns, noun phrases]
 
-        private readonly object obj;
+        private readonly object _obj;
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // Constructor
 
         public PrivateObject(object obj) {
-            this.obj = obj;
+            _obj = obj;
         }
 
         ///////////////////////////////////////////////////////////////////////////////////////////////
         // public Methods [verb, verb phrases]
 
         public object Invoke(string methodName, params object[] args) {
-            var _type = obj.GetType();
-            var _bindingFlags = BindingFlags.InvokeMethod | BindingFlags.NonPublic | BindingFlags.Instance;
+            var type = _obj.GetType();
+            var bindingFlags = BindingFlags.InvokeMethod | BindingFlags.NonPublic | BindingFlags.Instance;
             try {
-                return _type.InvokeMember(methodName, _bindingFlags, null, obj, args);
+                return type.InvokeMember(methodName, bindingFlags, null, _obj, args);
             } catch (Exception ex) {
                 throw ex.InnerException;
             }
         }
 
         public object Invoke(string methodName) {
-            var _type = obj.GetType();
-            var _bindingFlags = BindingFlags.InvokeMethod | BindingFlags.GetProperty | BindingFlags.NonPublic | BindingFlags.Instance;
+            var type = _obj.GetType();
+            var bindingFlags = BindingFlags.InvokeMethod | BindingFlags.GetProperty | BindingFlags.NonPublic | BindingFlags.Instance;
             try {
-                return _type.InvokeMember(methodName, _bindingFlags, null, obj, null);
+                return type.InvokeMember(methodName, bindingFlags, null, _obj, null);
             } catch (Exception ex) {
                 throw ex.InnerException;
             }
diff --git a/MidiPlayerTests/SoundFontTests.cs b/MidiPlayerTests/SoundFontTests.cs
index df3a29f..073a8b2 100644
--- a/MidiPlayerTests/SoundFontTests.cs
+++ b/MidiPlayerTests/SoundFontTests.cs
@@ -7,13 +7,13 @@ namespace MidiPlayer.SoundFont.Tests {
     public class SoundFontInfoTests {
         [TestMethod()]
         public void GetVoiceTest() {
-            var _target = new SoundFontInfo("../data/OmegaGMGS2.sf2");
-            var _result1 = _target.GetVoice(0, 0);
-            AreEqual("Grand Piano", _result1); // bank:0, prog:0
-            var _result2 = _target.GetVoice(8, 38);
-            AreEqual("Synth Bass 3", _result2); // bank:8, prog:38
-            var _result3 = _target.GetVoice(128, 8);
-            AreEqual("Room Kit", _result3); // bank:128, prog:8
+            var target = new SoundFontInfo("../data/OmegaGMGS2.sf2");
+            var result1 = target.GetVoice(0, 0);
+            AreEqual("Grand Piano", result1); // bank:0, prog:0
+            var result2 = target.GetVoice(8, 38);
+            AreEqual("Synth Bass 3", result2); // bank:8, prog:38
+            var result3 = target.GetVoice(128, 8);
+            AreEqual("Room Kit", result3); // bank:128, prog:8
         }
     }
 }
diff --git a/MidiPlayerTests/StandardMidiFileTests.cs b/MidiPlayerTests/StandardMidiFileTests.cs
index 0e3f3fc..c1ec979 100644
--- a/MidiPlayerTests/StandardMidiFileTests.cs
+++ b/MidiPlayerTests/StandardMidiFileTests.cs
@@ -8,158 +8,158 @@ namespace MidiPlayer.Midi.Test {
     public class StandardMidiFileTests {
         [TestMethod()]
         public void getTrackNameAndMidiChannelTest1() {
-            var _target = new StandardMidiFile("../data/Cmon_v1.mid");
-            var _private = new PrivateObject(_target);
-            var _result0 = _private.Invoke("getTrackNameAndMidiChannel", 0);
-            AreEqual(("Cmon", -1), _result0);
-            var _result1 = _private.Invoke("getTrackNameAndMidiChannel", 1);
-            AreEqual(("Vocal Main", 13), _result1);
-            var _result2 = _private.Invoke("getTrackNameAndMidiChannel", 2);
-            AreEqual(("Vocal Cho", 0), _result2);
-            var _result3 = _private.Invoke("getTrackNameAndMidiChannel", 3);
-            AreEqual(("Synth Sqe", 15), _result3);
-            var _result4 = _private.Invoke("getTrackNameAndMidiChannel", 4);
-            AreEqual(("Synth Pad", 14), _result4);
-            var _result5 = _private.Invoke("getTrackNameAndMidiChannel", 5);
-            AreEqual(("Guiter Riff", 12), _result5);
-            var _result6 = _private.Invoke("getTrackNameAndMidiChannel", 6);
-            AreEqual(("Bass", 11), _result6);
-            var _result7 = _private.Invoke("getTrackNameAndMidiChannel", 7);
-            AreEqual(("Drum OverTop", 9), _result7);
-            var _result8 = _private.Invoke("getTrackNameAndMidiChannel", 8);
-            AreEqual(("Durm SN & BD", 9), _result8);
+            var target = new StandardMidiFile("../data/Cmon_v1.mid");
+            var privateObj = new PrivateObject(target);
+            var result0 = privateObj.Invoke("getTrackNameAndMidiChannel", 0);
+            AreEqual(("Cmon", -1), result0);
+            var result1 = privateObj.Invoke("getTrackNameAndMidiChannel", 1);
+            AreEqual(("Vocal Main", 13), result1);
+            var result2 = privateObj.Invoke("getTrackNameAndMidiChannel", 2);
+            AreEqual(("Vocal Cho", 0), result2);
+            var result3 = privateObj.Invoke("getTrackNameAndMidiChannel", 3);
+            AreEqual(("Synth Sqe", 15), result3);
+            var result4 = privateObj.Invoke("getTrackNameAndMidiChannel", 4);
+            AreEqual(("Synth Pad", 14), result4);
+            var result5 = privateObj.Invoke("getTrackNameAndMidiChannel", 5);
+            AreEqual(("Guiter Riff", 12), result5);
+            var result6 = privateObj.Invoke("getTrackNameAndMidiChannel", 6);
+            AreEqual(("Bass", 11), result6);
+            var result7 = privateObj.Invoke("getTrackNameAndMidiChannel", 7);
+            AreEqual(("Drum OverTop", 9), result7);
+            var result8 = privateObj.Invoke("getTrackNameAndMidiChannel", 8);
+            AreEqual(("Durm SN & BD", 9), result8);
         }
 
         [TestMethod()]
         [ExpectedException(typeof(System.ArgumentOutOfRangeException))]
         public void getTrackNameAndMidiChannelTest2() {
-            var _target = new StandardMidiFile("../data/Cmon_v1.mid");
-            var _private = new PrivateObject(_target);
-            _private.Invoke("getTrackNameAndMidiChannel", 9);
+            var target = new StandardMidiFile("../data/Cmon_v1.mid");
+            var privateObj = new PrivateObject(target);
+            privateObj.Invoke("getTrackNameAndMidiChannel", 9);
         }
 
         [TestMethod()]
         public void TrackCountTest1() {
-            var _target = new StandardMidiFile("../data/Cmon_v1.mid");
-            var _result = _target.TrackCount;
-            AreEqual(8, _result);
+            var target = new StandardMidiFile("../data/Cmon_v1.mid");
+            var result = target.TrackCount;
+            AreEqual(8, result);
         }
 
         [TestMethod()]
         public void TrackCountTest2() {
-            var _target = new StandardMidiFile("../data/ABC_v1.mid");
-            var _result = _target.TrackCount;
-            AreEqual(14, _result);
+            var target = new StandardMidiFile("../data/ABC_v1.mid");
+            var result = target.TrackCount;
+            AreEqual(14, result);
         }
 
         [TestMethod()]
         public void TrackCountTest3() {
-            var _target = new StandardMidiFile("../data/DoYouSay_v4.mid");
-            var _result = _target.TrackCount;
-            AreEqual(8, _result);
+            var target = new StandardMidiFile("../data/DoYouSay_v4.mid");
+            var result = target.TrackCount;
+            AreEqual(8, result);
         }
 
         [TestMethod()]
         public void MidiChannelListTest1() {
-            var _target = new StandardMidiFile("../data/Cmon_v1.mid");
-            var _result = _target.MidiChannelList;
-            CollectionAssert.AreEqual(new List<int>() { 13, 0, 15, 14, 12, 11, 9, 9 }, _result);
+            var target = new StandardMidiFile("../data/Cmon_v1.mid");
+            var result = target.MidiChannelList;
+            CollectionAssert.AreEqual(new List<int>() { 13, 0, 15, 14, 12, 11, 9, 9 }, result);
         }
 
         [TestMethod()]
         public void GetTrackNameTest1() {
-            var _target = new StandardMidiFile("../data/Cmon_v1.mid");
-            var _result1 = _target.GetTrackName(1);
-            AreEqual("Vocal Main", _result1);
-            var _result2 = _target.GetTrackName(2);
-            AreEqual("Vocal Cho", _result2);
-            var _result3 = _target.GetTrackName(3);
-            AreEqual("Synth Sqe", _result3);
-            var _result4 = _target.GetTrackName(4);
-            AreEqual("Synth Pad", _result4);
-            var _result5 = _target.GetTrackName(5);
-            AreEqual("Guiter Riff", _result5);
-            var _result6 = _target.GetTrackName(6);
-            AreEqual("Bass", _result6);
-            var _result7 = _target.GetTrackName(7);
-            AreEqual("Drum OverTop", _result7);
-            var _result8 = _target.GetTrackName(8);
-            AreEqual("Durm SN & BD", _result8);
+            var target = new StandardMidiFile("../data/Cmon_v1.mid");
+            var result1 = target.GetTrackName(1);
+            AreEqual("Vocal Main", result1);
+            var result2 = target.GetTrackName(2);
+            AreEqual("Vocal Cho", result2);
+            var result3 = target.GetTrackName(3);
+            AreEqual("Synth Sqe", result3);
+            var result4 = target.GetTrackName(4);
+            AreEqual("Synth Pad", result4);
+            var result5 = target.GetTrackName(5);
+            AreEqual("Guiter Riff", result5);
+            var result6 = target.GetTrackName(6);
+            AreEqual("Bass", result6);
+            var result7 = target.GetTrackName(7);
+            AreEqual("Drum OverTop", result7);
+            var result8 = target.GetTrackName(8);
+            AreEqual("Durm SN & BD", result8);
         }
 
         [TestMethod()]
         public void GetTrackNameTest2() {
-            var _target = new StandardMidiFile("../data/Tornado_v2.mid");
-            var _result0 = _target.GetTrackName(0);
-            AreEqual("Tornado", _result0);
-            var _result1 = _target.GetTrackName(1);
-            AreEqual("Bass", _result1);
-            var _result2 = _target.GetTrackName(2);
-            AreEqual("Seque", _result2);
-            var _result3 = _target.GetTrackName(3);
-            AreEqual("Pad", _result3);
-            var _result4 = _target.GetTrackName(4);
-            AreEqual("Melody", _result4);
-            var _result5 = _target.GetTrackName(5);
-            AreEqual("Drum", _result5);
+            var target = new StandardMidiFile("../data/Tornado_v2.mid");
+            var result0 = target.GetTrackName(0);
+            AreEqual("Tornado", result0);
+            var result1 = target.GetTrackName(1);
+            AreEqual("Bass", result1);
+            var result2 = target.GetTrackName(2);
+            AreEqual("Seque", result2);
+            var result3 = target.GetTrackName(3);
+            AreEqual("Pad", result3);
+            var result4 = target.GetTrackName(4);
+            AreEqual("Melody", result4);
+            var result5 = target.GetTrackName(5);
+            AreEqual("Drum", result5);
         }
 
         [TestMethod()]
         public void GetTrackNameTest3() {
-            var _target = new StandardMidiFile("../data/ABC_v1.mid");
-            var _result0 = _target.GetTrackName(0);
-            AreEqual("ABC", _result0);
-            var _result1 = _target.GetTrackName(1);
-            AreEqual("Brass1", _result1);
-            var _result2 = _target.GetTrackName(2);
-            AreEqual("Brass2", _result2);
-            var _result3 = _target.GetTrackName(3);
-            AreEqual("Melody Main", _result3);
-            var _result4 = _target.GetTrackName(4);
-            AreEqual("Synth Reff", _result4);
-            var _result5 = _target.GetTrackName(5);
-            AreEqual("Synth Pad2", _result5);
-            var _result6 = _target.GetTrackName(6);
-            AreEqual("Synth Pad1", _result6);
-            var _result7 = _target.GetTrackName(7);
-            AreEqual("DX Reff", _result7);
-            var _result8 = _target.GetTrackName(8);
-            AreEqual("Drum Main", _result8);
-            var _result9 = _target.GetTrackName(9);
-            AreEqual("Percussion1", _result9);
-            var _result10 = _target.GetTrackName(10);
-            AreEqual("Percussion2", _result10);
-            var _result11 = _target.GetTrackName(11);
-            AreEqual("Bass", _result11);
-            var _result12 = _target.GetTrackName(12);
-            AreEqual("Bass over dub", _result12);
-            var _result13 = _target.GetTrackName(13);
-            AreEqual("DX Sequence", _result13);
-            var _result14 = _target.GetTrackName(14);
-            AreEqual("Orchestral Hit", _result14);
+            var target = new StandardMidiFile("../data/ABC_v1.mid");
+            var result0 = target.GetTrackName(0);
+            AreEqual("ABC", result0);
+            var result1 = target.GetTrackName(1);
+            AreEqual("Brass1", result1);
+            var result2 = target.GetTrackName(2);
+            AreEqual("Brass2", result2);
+            var result3 = target.GetTrackName(3);
+            AreEqual("Melody Main", result3);
+            var result4 = target.GetTrackName(4);
+            AreEqual("Synth Reff", result4);
+            var result5 = target.GetTrackName(5);
+            AreEqual("Synth Pad2", result5);
+            var result6 = target.GetTrackName(6);
+            AreEqual("Synth Pad1", result6);
+            var result7 = target.GetTrackName(7);
+            AreEqual("DX Reff", result7);
+            var result8 = target.GetTrackName(8);
+            AreEqual("Drum Main", result8);
+            var result9 = target.GetTrackName(9);
+            AreEqual("Percussion1", result9);
+            var result10 = target.GetTrackName(10);
+            AreEqual("Percussion2", result10);
+            var result11 = target.GetTrackName(11);
+            AreEqual("Bass", result11);
+            var result12 = target.GetTrackName(12);
+            AreEqual("Bass over dub", result12);
+            var result13 = target.GetTrackName(13);
+            AreEqual("DX Sequence", result13);
+            var result14 = target.GetTrackName(14);
+            AreEqual("Orchestral Hit", result14);
         }
 
         [TestMethod()]
         public void GetTrackNameTest4() {
-            var _target = new StandardMidiFile("../data/DoYouSay_v4.mid");
-            var _result0 = _target.GetTrackName(0);
-            AreEqual("DoYouSay", _result0);
-            var _result1 = _target.GetTrackName(1);
-            AreEqual("Vocal Main", _result1);
-            var _result2 = _target.GetTrackName(2);
-            AreEqual("Vocal Cho", _result2);
-            var _result3 = _target.GetTrackName(3);
-            AreEqual("Synth Pad", _result3);
-            var _result4 = _target.GetTrackName(4);
-            AreEqual("Guiter Clean", _result4);
-            var _result5 = _target.GetTrackName(5);
-            AreEqual("Guiter Riff", _result5);
-            var _result6 = _target.GetTrackName(6);
-            AreEqual("Bass", _result6);
-            var _result7 = _target.GetTrackName(7);
-            AreEqual("Drum OverTop", _result7);
-            var _result8 = _target.GetTrackName(8);
-            AreEqual("Drum SN & BD", _result8);
+            var target = new StandardMidiFile("../data/DoYouSay_v4.mid");
+            var result0 = target.GetTrackName(0);
+            AreEqual("DoYouSay", result0);
+            var result1 = target.GetTrackName(1);
+            AreEqual("Vocal Main", result1);
+            var result2 = target.GetTrackName(2);
+            AreEqual("Vocal Cho", result2);
+            var result3 = target.GetTrackName(3);
+            AreEqual("Synth Pad", result3);
+            var result4 = target.GetTrackName(4);
+            AreEqual("Guiter Clean", result4);
+            var result5 = target.GetTrackName(5);
+            AreEqual("Guiter Riff", result5);
+            var result6 = target.GetTrackName(6);
+            AreEqual("Bass", result6);
+            var result7 = target.GetTrackName(7);
+            AreEqual("Drum OverTop", result7);
+            var result8 = target.GetTrackName(8);
+            AreEqual("Drum SN & BD", result8);
         }
     }
 }
diff --git a/MidiPlayerTests/SynthTests.cs b/MidiPlayerTests/SynthTests.cs
index ad6896c..0e14414 100644
--- a/MidiPlayerTests/SynthTests.cs
+++ b/MidiPlayerTests/SynthTests.cs
@@ -11,62 +11,62 @@ namespace MidiPlayer.Test {
     public class SynthTests {
         [TestMethod()]
         public void GetBankTest1() {
-            var _result = Synth.GetBank(0);
-            AreEqual(0, _result);
+            var result = Synth.GetBank(0);
+            AreEqual(0, result);
         }
 
         [TestMethod()]
         public void GetBankTest2() {
-            var _result = Synth.GetBank(7);
-            AreEqual(128, _result);
+            var result = Synth.GetBank(7);
+            AreEqual(128, result);
         }
 
         [TestMethod()]
         public void GetProgramTest1() {
-            var _result = Synth.GetProgram(1);
-            AreEqual(58, _result);
+            var result = Synth.GetProgram(1);
+            AreEqual(58, result);
         }
 
         [TestMethod()]
         public void GetProgramTest2() {
-            var _result = Synth.GetProgram(8);
-            AreEqual(16, _result);
+            var result = Synth.GetProgram(8);
+            AreEqual(16, result);
         }
 
         [TestMethod()]
         public void GetVoiceTest1() {
-            var _result = Synth.GetVoice(1);
-            AreEqual("Tuba", _result);
+            var result = Synth.GetVoice(1);
+            AreEqual("Tuba", result);
         }
 
         [TestMethod()]
         public void GetVoiceTest2() {
-            var _result = Synth.GetVoice(8);
-            AreEqual("Power Kit", _result);
+            var result = Synth.GetVoice(8);
+            AreEqual("Power Kit", result);
         }
 
         [TestMethod()]
         public void GetVoiceTest3() {
-            var _result = Synth.GetVoice(4);
-            AreEqual("Warm Pad", _result);
+            var result = Synth.GetVoice(4);
+            AreEqual("Warm Pad", result);
         }
 
         [TestMethod()]
         public void GetTrackNameTest1() {
-            var _result = Synth.GetTrackName(0);
-            AreEqual("Cmon", _result);
+            var result = Synth.GetTrackName(0);
+            AreEqual("Cmon", result);
         }
 
         [TestMethod()]
         public void GetTrackNameTest2() {
-            var _result = Synth.GetTrackName(6);
-            AreEqual("Bass", _result);
+            var result = Synth.GetTrackName(6);
+            AreEqual("Bass", result);
         }
 
         [TestMethod()]
         public void GetTrackNameTest3() {
-            var _result = Synth.GetTrackName(7);
-            AreEqual("Drum OverTop", _result);
+            var result = Synth.GetTrackName(7);
+            AreEqual("Drum OverTop", result);
         }
 
         [TestInitialize]