And the winner of the most unexpectedly, well-named, software synth.... is...

@todbot for My Little Droney.

Classic. Well played :)

https://github.com/todbot/qtpy_synth/blob/main/circuitpython/dronesynth/my_little_droney.py

Thanks to adafruit for merging the SAML22 support into their #CircuitPython ASF4 tree, you can now easily build my Sensor Watch micropython without needing a custom git submodule.