This is a demo of Auduino, the Arduino synthesizer.

Auduino is a synth DIY project, 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.

Description:

The Auduino is a sound synthesiser based on the Arduino platform. The prototype uses the Arduino Diecimila, although any modern Arduino with an ATmega168 chip will work fine. It uses granular synthesis techniques to generate a distinctive filter-sweep sound that had much more character than boring square waves.

via tinker.it