Release Apply track fader volume to all items in selected tracks and reset faders to 0dB v1.0

Items Properties/amagalma_Apply track fader volume to all items in selected tracks and reset faders to 0dB.lua

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+-- @description Apply track fader volume to all items in selected tracks and reset faders to 0dB
+-- @author amagalma
+-- @version 1.0
+-- @donation https://www.paypal.me/amagalma
+
+local sel_tracks = reaper.CountSelectedTracks( 0 )
+
+if sel_tracks == 0 then
+  reaper.MB("No changes...", "No tracks selected!", 0 )
+  reaper.defer(function() end)
+end
+
+reaper.PreventUIRefresh( 1 )
+reaper.Undo_BeginBlock2( 0 )
+
+for tr = 0, sel_tracks-1 do
+  local track = reaper.GetSelectedTrack( 0, tr )
+  local tr_vol = reaper.GetMediaTrackInfo_Value( track, "D_VOL" )
+  if tr_vol ~= 1 then
+    reaper.SetMediaTrackInfo_Value( track, "D_VOL", 1 )
+    local item_cnt = reaper.CountTrackMediaItems( track )
+    for it = 0, item_cnt-1 do
+      local item = reaper.GetTrackMediaItem( track, it )
+      local it_vol = reaper.GetMediaItemInfo_Value( item, "D_VOL" )
+      reaper.SetMediaItemInfo_Value( item, "D_VOL", it_vol*tr_vol )
+    end
+  end
+end
+
+reaper.PreventUIRefresh( -1 )
+reaper.UpdateArrange()
+reaper.Undo_EndBlock2( 0, "Reset track faders to 0dB", 1|4 )