It depends really…
Since the “track play” notes are already defined a certain note per track, auto channel should work just fine, probably any midi channel assigned to an audio track but I haven’t tested… The notes themselves specify what track to launch so the channel shouldn’t matter as long as OT is listening to it…
For things like chromatic playback or manipulating playback page parameters by CC, they are the same notes and CC’s for every track, no distinct track separation. For those you’d have to use the tracks specific midi channel or use the auto channel with the track selected…
