Steps to recreate:
[LIST=1]
[*]File->New
[*]Quest->Test; listen for Zelda overworld theme playing
[*]Quest->Test; listen for for MIDI keys stuck on for about 12 seconds while Zelda overworld theme begins playing again
[/LIST]
Stuck MIDI keys when testing while already testing
In play_midi.cpp we have zc_stop_midi()