Polyphonic MIDI Synth on an ATtiny2313:
This is the fourth synthesizer cable I’ve built, the first three being based on the ATtiny85. I have been looking into ARM chips but haven’t gotten to grips with them just yet. Instead, I decided go back to the ATtiny2313, which has a quarter of the memories of the tiny85, but a hardware UART port and more pins.
Polyphonic Synth Cable – [Link]