Pocket Piano Arduino Shield
This is a board for making the Arduino into a portable stand alone music synthesizer. It plugs directly into the Arduino board and provides 25 multiplexed keys (2 full octaves), 4 pots, status LED, reset switch, digital to analog converter IC, and a RCA audio jack. The Arduino board with its powerful AVR processor is more than adequate for a wide range of sound synthesis techniques.
   Pocket Piano Arduino Shield
at www.critterandguitari.com