[Maarten] originally used an Atmel 90S2313 AVR and later upgraded to an ATtiny 2313, which was easy because the two are pin-compatible. The 2313 outputs PWM, which duty-cycles the LED to create a ...

[mitxela]’s polyphonic synth for the ATtiny 2313 does just that, using only two kilobytes of Flash and fitting inside a MIDI jack. Putting a MIDI synth into a MIDI plug is something we’ve seen ...