Auduino

Auduino from Tinker.it! on Vimeo.
"Having a play with the Auduino synthesiser.

Auduino is based on the Arduino board. The audio is coming direct from Arduino PWM output with only a slight external reverb. No other effects were used.

Construction details and code here"

via Peter of Tinker it!:
"Me and the team at Tinker.it have put together a softsynth for Arduino entitled Auduino (a contraction of Audio Arduino) and I thought you might be interested. I've released the source and schematic, so everyone can hack around with it.

Video (above)
Construction and hacking notes
Source code
Eye candy"