Show staff names for unknown MIDI type
Drum notation appears
Fix null last measure for empty MIDI files
Fix drum sound
Fix percussion track name
Voice depend on stem direction for drum tracks
Test for percussion MIDI import
Fix regression tests (add Grand Piano track name)
Delete swing test files (they are not for this branch)
Add check for tuplet duplicates in drum tracks
Split drum track operation
Bracket for group of drum staffs
Pickup measure checkbox
Checkbox to show or not drum staff bracket
Add swing test files back