Key shift affects drums.

[Somni]

Adjusting the key shift erroneously changes the drum bank, causing the percussion to get really weird depending on what key you’ve moved into. What should be a woodblock, for example, might become a cuica. This is solved simply:

var key_shift:int = self.key_shift
if channel.drum_track:
    key_shift = 0

var key_number:int = note + key_shift

Applied to both _process_track_event_note_on and _process_track_event_note_off in MidiPlayer.gd.

[きのもと結衣]

Thanks for report. I completely forget that implemented key_shift. lol

I fixed it at a44ba91