Creating a playback progress indicator with asynchronous waits

Hi all,

I'm currently trying to develop an instrument that will feature multiple draggable waveforms (essentially just fancy sliders) that will allow you to adjust the timings between each sample. I'm currently doing this with wait statements inside the on_note callback. I'm also trying to incorporate a playhead to indicate the playback position along the timeline. (See example image attached)

I have each working independently, but when I attempt to use them together, I lose the delay on the sample start. Can I not run 2 wait statements in parallel, presumably? Any ideas on how I can get this to work? (See code below)

Thanks guys!

Code:

on init

    message("")

    load_performance_view("perfview.nckp")

    declare $layer1WaitTime := 0
    declare $counter := 1

end on

function startProgressAnim()

    $counter := 1

    while ($counter <= 200)

        $progressSlider := $counter
        inc($counter)
        wait(100000)

    end while

end function

on note

    call startProgressAnim()

    ignore_event($EVENT_ID)

    disallow_group($ALL_GROUPS)

    allow_group(0)
    wait($layer1WaitTime)
    play_note($EVENT_NOTE, $EVENT_VELOCITY, 0, -1)
    disallow_group($ALL_GROUPS)

end on

on ui_control($slider)

    $layer1WaitTime := $slider
    message("Layer 1 Delay = " & $layer1WaitTime)

end on