Bugfix for lockup when changing between Melodic and Percussion

Adresses bug #4

Bugfix for playback

• Bugfix for stray bass and broken channel volume

Fixed pitch correction

• Bugfix for tab key in controls
• Added correct fields for fixed pitch interpretation of values

Fixed Percussion playback

20230708

Bugfix: Preview Playback of Percussion didn't work

Initial release (with initial load bugfix)

20230615

Initial commit