Midi For Light

-- DRAFT -- Primary written for Mixxx Version 1.12 (most is the same under 1.11) --

The Midi_for_light controller

Midi_for_light is a controller for mixxx. It sends "light intresting" midi signals. The lightshow can follow in different ways the music.
The script requires no intervention as soon as you have configured it according to your needs. The DJ must not be disturbed during the event.

The current deck

The current deck is detected automatically, but it is important to know a little about it. To achieve this, several mixxx-parameter are used. These are:

• The "crossfader"
• All deck "volume control"
• All deck "play/pause button"

The script must find out what mix method is used by the DJ. Use the cross fader or the volume control? For this purpose, the cross fader is observed. Is this more than 3 seconds in the middle position, it is assumed that a mixture using the volume controls. Otherwise the cross fader is not in middle position: The DJ used cross fader for mixing.
To prevent a over charging of the light software, high frequency deck changes are suppressed.
The best way to understand the automated deck change: Play a little in mixxx while a simple light sequence, synced by beat, is running.

Beat

Probably the most common and simplest signal. You just have to know one thing: Running multiple decks will be sent only to the beat of the current.
Tip: To get a better beat signal customize the options of "Beat Detection" in the preferences. I use this combination.

VU-Meter

Here you can choose from many different signals. All refer to the master VU meter. First distinction is mono-, left- and right channel. Next, a distinction is made between actual and calculated values. You have the choice.

In practice, the absolute value of VU does not generate large visible change to the light. Therefore, there are the calculated values. Calculated from the last 2 seconds.

Values with the label "Meter1" to "meter4" belong together. So you can, for example, form a real VU meter.

MTC, midi time code

The script sends MTC based on 25 frames per second. Only full frames be sent. No short message. By the use of full frames, a speed change (pitch) is no problem. It is also useful when creating a light show. Stop, forward, backward and jumps are transmitted correctly.

• The transmitted time code is determined by the current deck.
• Time code is transmitted only if the position (time) changes in the song.
• To send time code via midi can be switched off under "personal setting" of the script.

Overview MIDI Notes

action	note	value
deck change	C ( 48 / 0x30 )	100 / 0x64 (+new decknumber)
beat	D ( 50 / 0x32 )	100 / 0x64
BPM	E ( 52 / 0x34 )	BPM - 50
VU mono current	E ( 64 / 0x40 )	0-127 / 0x0-0x7f
VU mono average min	F ( 65 / 0x41 )	0-127 / 0x0-0x7f
VU mono average mid	F# ( 66 / 0x42 )	0-127 / 0x0-0x7f
VU mono average max	G ( 67 / 0x43 )	0-127 / 0x0-0x7f
VU mono average fit	G# ( 68 / 0x44 )	0-127 / 0x0-0x7f
VU mono current meter 1	A ( 69 / 0x45 )	0-127 / 0x0-0x7f
VU mono current meter 2	A# ( 70 / 0x46 )	0-127 / 0x0-0x7f
VU mono current meter 3	B ( 71 / 0x47 )	0-127 / 0x0-0x7f
VU mono current meter 4	C ( 72 / 0x48 )	0-127 / 0x0-0x7f
VU mono average meter 1	A ( 73 / 0x49 )	0-127 / 0x0-0x7f
VU mono average meter 2	A# ( 74 / 0x4a )	0-127 / 0x0-0x7f
VU mono average meter 3	B ( 75 / 0x4b )	0-127 / 0x0-0x7f
VU mono average meter 4	C ( 76 / 0x4c )	0-127 / 0x0-0x7f
VU left current	G# ( 80 / 0x50 )	0-127 / 0x0-0x7f
VU left average min	A ( 81 / 0x51 )	0-127 / 0x0-0x7f
VU left average mid	A# ( 82 / 0x52 )	0-127 / 0x0-0x7f
VU left average max	B ( 83 / 0x53 )	0-127 / 0x0-0x7f
VU left average fit	C ( 84 / 0x54 )	0-127 / 0x0-0x7f
VU left current meter 1	C# ( 85 / 0x55 )	0-127 / 0x0-0x7f
VU left current meter 2	D ( 86 / 0x56 )	0-127 / 0x0-0x7f
VU left current meter 3	D# ( 87 / 0x57 )	0-127 / 0x0-0x7f
VU left current meter 4	E ( 88 / 0x58 )	0-127 / 0x0-0x7f
VU left average meter 1	F ( 89 / 0x59 )	0-127 / 0x0-0x7f
VU left average meter 2	F# ( 90 / 0x5a )	0-127 / 0x0-0x7f
VU left average meter 3	G ( 91 / 0x5b )	0-127 / 0x0-0x7f
VU left average meter 4	G# ( 92 / 0x5c )	0-127 / 0x0-0x7f
VU right current	C ( 96 / 0x60 )	0-127 / 0x0-0x7f
VU right average min	C# ( 97 / 0x61 )	0-127 / 0x0-0x7f
VU right average mid	D ( 98 / 0x62 )	0-127 / 0x0-0x7f
VU right average max	D# ( 99 / 0x63 )	0-127 / 0x0-0x7f
VU right average fit	E ( 100 / 0x64 )	0-127 / 0x0-0x7f
VU right current meter 1	F ( 101 / 0x65 )	0-127 / 0x0-0x7f
VU right current meter 2	F# ( 102 / 0x66 )	0-127 / 0x0-0x7f
VU right current meter 3	G ( 103 / 0x67 )	0-127 / 0x0-0x7f
VU right current meter 4	G# ( 104 / 0x68 )	0-127 / 0x0-0x7f
VU right average meter 1	A ( 105 / 0x69 )	0-127 / 0x0-0x7f
VU right average meter 2	A# ( 106 / 0x6a )	0-127 / 0x0-0x7f
VU right average meter 3	B ( 107 / 0x6b )	0-127 / 0x0-0x7f
VU right average meter 4	C ( 108 / 0x6c )	0-127 / 0x0-0x7f