Minor improvements and fixes
Play MIDI song with mapped instruments.
Convert file (from .mid to .wav or .m4a).
Change play speed and active channels.
Support reverb and chorus effects.
Shake phone to make music sounds.
Tap buttons to play MIDI notes.
Record and save your singalong.
Display MIDI file musical notes.
Create and save MIDI melodies.
Unlimited undo and redo edits.
Support music chord editing.
Print sheet music to PDF file.
