Handle tempo changes correctly.  Use the playback queue structure only when doing actual playback, when doing "shadow playback" to determine current sequencer state there is no need for note joining, so no need to go through playback queue.
Handle tempo changes correctly.  Use the playback queue structure
only when doing actual playback, when doing "shadow playback"
to determine current sequencer state there is no need for note joining,
so no need to go through playback queue.

turnipsi/mdl,turnipsi/mdl