![](http://farm3.static.flickr.com/2735/4297061446_f36c91e8a8.jpg)
[click for larger]
It started as the OrcaSynth (a mod of a HackADay project), turned into the DigiSynth, and now has finished off as SynthZilla!
The final build includes control over pitch, duty, portamento, 2 LFOs, tone, body, gain, vol, 8-step voltage sequencer, and more!
![](http://farm5.static.flickr.com/4058/4297077778_8ee7c49078.jpg)
![](http://farm5.static.flickr.com/4037/4296314781_7fee9846e6.jpg)
[click for larger]
Below is the schematic I used. Not all the components are labelled and I didn't draw in the bypass jacks for all the knobs, but you get the idea. Let me know if you'd like a cleaner, complete schematic and I will happily oblige.
![](http://farm3.static.flickr.com/2777/4297061014_7d73f05a77.jpg)
[click for larger]
A couple notes: I used a quad-amp simply because I was out of single amp ICs. Also, the tone/body filter only works well through headphones or an external amp, not the onboard speaker.