The new microcontroller came in, and this time the real 'onboard' synthesizer is being demonstrated. The Pi will probably still be on the base station, but this synth will run directly on the microcontroller, without the need for external anything.

I've also added the sourcecode to a four oscillator woodwind controller synth to github for the Teensy 4.0: https://github.com/jeffmhopkins/Open-Woodwind-Project/blob/master/owp4/owp_synth.ino

Here's a demo of some upper octave stuff to show the aliasing:

https://soundcloud.com/jeff-m-hopkins/open-woodwind-project-teensy-library-upper-octave-testing