Funny thing is I almost put this shot up when I saw it on flickr a few minutes ago. Something told me to hold off and sure enough a post went up on Analog Industries. It turns out this is a side project of Chris Randall's (Chris of Analog Industries and Audio Damage). "One of the roughly 8,000 projects I'm currently working on is a small synthesizer built almost entirely on an Arduino. The only external chips are the DAC and the opto-isolator for the MIDI input. It remains to be seen whether the Arduino will be fast enough to pull this off. I would like to make it a normal 1-osc subtractive synth, but Adam (who has far more experience with microcontrollers than I) says that the Atmega 16 (the Arduino's brain) isn't fast enough to do the real-time math necessary for a resonant filter." You can read about the project here.
Perhaps you could point Adam in the direction of this AVRsyn variant, which includes an SVF and a Moog filter as options. He might be impressed :)
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