@Simon. This circuit needs lots of work before I will consider making PCBs available. There is lots of info including schematics <a href="http://casperelectronics.com/finished-pieces/mini-modular-noise-system/" rel="nofollow">here</a>. Its a crude little synth that uses a few cheap tricks to make cool sounds. You just need a few VCOs and a few ring modulators and you can do a lot of cool stuff! The magic comes from making feedback loops between the oscillators.