[McAroni]

One final thing, I would find it very helpful to be able to have a smart button start audio at a specific timestamp. That would make it possible to put smart buttons next to rehearsal marks (or at the top of each page) and have the music queued up for practicing that section/page. It would also eliminate trying to get the slider set to the right position, hitting play and quickly minimizing the player to see the music to start practicing.

You could already do that. Create a Smart Button -> load and play audio track -> Assign the current audio position or your own time from where the audio should start.
If you press the smart button the audio will start from that point
I also assigned a touch action to top center to start and stop the audio track. so there is no need to bring up the audio player.