track_send_switch.lua

  -- /song/track/XXX/send_switch
  -- see http://neurogami.com/blog/neurogami-renoise-send-track-scripting-with-osc.html
  add_track_action { 
    pattern = "/send_switch", 
    description = "Change the receiver of the track's send device.\n" .. 
    "Requires you follow a naming convention",

    arguments = { argument("send_index", "number") },

    handler = function(track_index, send_index)
      local device_index
      local device
      print( ( "Triggered /song/track/XXX/send_switch for track index %d, send index %d"):format(track_index, send_index) )
      local tracks = song().tracks
      if ( send_tracks == nil ) then
        print("Go get send tracks")
        send_tracks = {}
        send_track_count = 0
        for i = 1,#renoise.song().tracks do
          if renoise.song().tracks[i].type == renoise.Track.TRACK_TYPE_SEND  then
            send_track_count = send_track_count + 1
            print("Storing send track: " .. renoise.song().tracks[i].name)
            send_tracks[send_track_count] =  renoise.song().tracks[i]
          end
        end
      else
        print("send_tracks = ")
        print(send_tracks)
      end
      if (track_index > 0 and track_index <= #tracks) then
        print("Found the track!")
        local send_device = nil
        local devices = tracks[track_index].devices
        if (#devices > 0 ) then
          local i, j
          for device_idx, device in ripairs(devices) do
            print(device.display_name)
            i, j = string.find(device.display_name, "send_")
            if i == 1 then
              local send_tag = string.gsub(device.display_name, "send_", "")
              print("Found a send device with tag " .. send_tag )
              send_device  = device
              local idx
              print( ("We have %d send tracks"):format(send_track_count ) )
              local match_count = 0;
              for idx = 1, send_track_count do
                print("Check name of send track '" .. send_tracks[idx].name .. "' for '" .. send_tag .. "'")
                i, j = string.find( send_tracks[idx].name, send_tag)
                if i then
                  match_count = match_count + 1
                  print("- - - - - - We have a send track tag match on send track " .. send_tracks[idx].name )
                  print(("Matched send track is idx %d and match_count %d "):format(idx, match_count) )
                  if match_count == send_index then
                    for __,param in ipairs(device.parameters) do
                      print(param.name)
                      if  param.name == "Receiver" then
                        param.value = idx-1
                        print("Updated value of  device " .. device.display_name )
                        break
                      end
                    end
                    break
                  end
                end
              end
              break
            end
          end
        end
      else
        print("That index is out of range: %d"):format(track_index)
      end
    end
  }