Just a note for myself here, really.

Rather than using combinations of buttons to determine pitch look into using two buttons to allow the player to cycle up and down through the ranges.

Also add momentary buttons to 'Octave up' and 'Octave down' for quick jumps when the range cycling won't be fast enough.

Volume control - use a thumb trigger on the left hand to control note velocity.

Also add a note on/off momentary switch where a mouthpiece could go and use lip/chin to trigger notes on or off, or use a traditional mouthpiece with some kind of air sensor in it.

Also project name:

I may update the name to RaspBone or TinkerBone depending on what board I settle on.