Look at the demo stack, it already sends "MIDI" style messages to the FluidSynth LCB extension! Currently the sticks send a FluidSynth pitch changing message, but you could change it to send anything you want. If you're on macOS you could use my CoreMIDI LCB (or the LCB AVAppleSampler or LCB_AudioUnitMusicInstrument ) lib instead. I was planning to map a stick to a WaWa Pedal Effect.
The thing I'm working on now is an LCB version of a "MIDI DataGrid" I made a few years back. It's an X/Y time-line grid, think horizontal "Piano-roll" style grid, like in GarageBand or Cubase. It's actually already working somewhat, saving MIDI (and Wave Files with FluidSynth). I'm trying to iron-out some line-selecting issues, but I plan to make an introduction video soon. The biggest thing slowing me down now (besides Life and a Day Job) is that I'm having too much fun making drum beats!