via these auctions:
Roland TB-303
Roland TR-606
customsynth.co.uk
Update: I thought this design looked familiar. Take a look at www.thebeast.co.uk
Note that there is no mention of The Beast in the auction.
EVERYTHING SYNTH
"the pollen is a compact variable analog noise generator with a few extras. the two main controls are "grain" which helps shape the static, and "pitch" which controls a self oscillating filter that helps to alter the pitch of the static and has a switchable range, high / low. there is also an external audio input with its own volume control and a switch to kill the internal noise source so it will allow the pollen to be used as a distortion box. the output is up to about 7 volts so that it can be used as a control voltage source. the output knob will allow you so turn it down to safe audio level as well.