Polyphony and wave-shaping on the Arduino

Hey, quick heads-up about a project I'm working on: I'm generating polyphonic sound with envelope shaping (ie applying attack/decay/sustain/release envelopes) with the Arduino, using AD5206 digipots and simple resistor-capacitor circuits for frequency generation.

Project info is here: http://itp.nyu.edu/~gpv206/2007/10/generating_polyphonic_sound_wi_1.html

I currently have 3 voices running, and getting 6 running is a matter of connecting a few wires.