drum preset selector

reaper.ClearConsole()

function print (msg) -- make a print function that automatically puts a line break
  reaper.ShowConsoleMsg(tostring(msg))
  reaper.ShowConsoleMsg("\n")
end
print(os.time())

global_drum_address = 0 -- just some number
reaper.gmem_attach(global_drum_address)
drumPresetSelector = reaper.gmem_read(global_drum_address)
print(drumPresetSelector)

-- Declare constants
local numPresets = 3
local firstDrumTrack = 22 -- Drums start at track 23, but Reaper counts 0-based

 -- Function to increment selector and arm/disarm tracks
function incrementAndArm ()
  drumPresetSelector = (drumPresetSelector + 1) % numPresets  -- Increment and wrap around at numPresets
  for i = firstDrumTrack,firstDrumTrack+numPresets-1 do  -- Loop through tracks
    track = reaper.GetTrack(0,i)
    print(i)
    print(drumPresetSelector)
    print(track)
    if i == firstDrumTrack + drumPresetSelector then
      response = reaper.SetMediaTrackInfo_Value(track, "I_RECARM", 1)
      print("arm" .. " " .. i .." " .. firstDrumTrack + drumPresetSelector)
    else
      response = reaper.SetMediaTrackInfo_Value(track, "I_RECARM", 0)  -- Disarm other tracks
      print("disarm")
    end
  end
  print(drumPresetSelector)
  reaper.gmem_write(global_drum_address,drumPresetSelector)
  return "done"
end

print(incrementAndArm())