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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@CJA_Music
It works a charm, Gordon. NoteOn and NoteOff!
With a bit of velocity randomisation in Ableton (which I imagine could be done on the Puck itself too, if one were inclined and more knowledgeable than I) you can get a reasonably musical performance with note randomisation on a given scale, different note lengths (thanks to noteOn and noteOff on rising and falling states of the BTN), and velocity changes.
Thanks all for helping with this. It's been inspiring to receive your help and wisdom! I'm very grateful.