--[[
   * ReaScript Name: Explode multichannel Audio (Non-destructive)
   * Lua script for Cockos REAPER
   * Author: EUGEN27771
   * Author URI: http://forum.cockos.com/member.php?u=50462
   * Licence: GPL v3
   * Version: 1.0
  ]]


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-- Non-destructive explode multichannel Audio --
------------------------------------------------
function non_destructive_explode()
  Item_ID = reaper.GetSelectedMediaItem(0,0)
  if Item_ID then Take_ID = reaper.GetActiveTake(Item_ID)
    if Take_ID and reaper.BR_IsTakeMidi(Take_ID)==false then 
       _, Item_Chunk = reaper.GetItemStateChunk(Item_ID , "", false)  -- Get Item Chunk
       PCM_source = reaper.GetMediaItemTake_Source(Take_ID)           -- Get Item Source
       SourceNChan = reaper.GetMediaSourceNumChannels(PCM_source)     -- Num Chan in source
       Item_Track = reaper.GetMediaItem_Track(Item_ID)                -- Get Item Track
       Track_Num = reaper.GetMediaTrackInfo_Value(Item_Track, "IP_TRACKNUMBER") -- Track number(1-based)
       index = Track_Num-1                                            -- Original Item_Track index 

         -- For each Source Channeel -- 
         for i=1, SourceNChan, 1 do
             reaper.InsertTrackAtIndex(index+i, 0)                    -- New_Track
             New_Track_ID = reaper.GetTrack(0, index+i)               -- Get New_Track ID
             New_Item = reaper.AddMediaItemToTrack(New_Track_ID)      -- New_Item
             reaper.SetItemStateChunk(New_Item, Item_Chunk, true)     -- Set Item Chunk
             New_Take = reaper.GetActiveTake(New_Item)                -- Get Acive take
             reaper.SetMediaItemTakeInfo_Value(New_Take, "I_CHANMODE", i+2) -- Set channel mode
         end
       
       -- Mute orig Item,Set folder states -- 
       reaper.SetMediaItemInfo_Value(Item_ID, "B_MUTE", 1)            -- Mute Original Item
       reaper.SetMediaTrackInfo_Value(New_Track_ID, "I_FOLDERDEPTH", -1) -- Set track is last in the innermost folder
       reaper.SetMediaTrackInfo_Value(Item_Track, "I_FOLDERDEPTH", 1)    -- Set track is a folder parent
       reaper.TrackList_AdjustWindows(0)                              -- update tracklist
    end
  end
end

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reaper.Undo_BeginBlock()
non_destructive_explode()
reaper.Undo_EndBlock("Explode multichannel Audio (Non-destructive)", -1)
reaper.UpdateArrange()