I wanted to use the Pico 2 for music, when there isn't need for as much power as Teensy 4 can provide. So after some minor edits to the Audio lib classes that I needed, here it is:
In this video I am sending MIDI over USB, and the sketch is...
Decades ago I saw some DIY ADSR designs used a 555 timer to hold the note automatically for a period of time. I don't know why anyone except a game developer would want this.
Yes, that is pretty much what I did, send an analog signal into the audio shield.
It works great but there's too much delay, unless you want to use the teensy for audio effects where delay is not a necessarily bad thing if you mix wet with dry...