One important motivation for me was that, I learn how to build in my own microcontroller (Arduino or otherwise), I could then use that skill to design all sorts of fun new modifications for the Polysix...like making a more flexible LFO, or like adding a set of six wavetable oscillators (one for each voice) to expand the synth's tonal palette. Oh, the fun that could be had!
So, I started by figuring out how to build an Arduino on a breadboard. It's been done many times before by others, but it's the first time that I've ever done it. I was surprised at how simple it was. If you're interested, you can check it out here:
Chip