I pimped an ordinary Atari Punk Console with some extra LEDs , a light sensitive resistor and … an arduino. It’s still a build in progress, I will have some pics up soon, but it WORKS.
I had some basic arduino sketch running, and I was fiddling with the pins on the 556 when suddenly a sound occurred. I was reproducible and so the synth was born.
I’m now working on the software which will either firmata/pduino or midi if I get the midi-in working. A third option is the netshield and puchabe.
I’ll keep you posted…