Here's some pics of a new module I've been helping to beta-test. I've previously built quite a few modules designed by Thomas Henry, but this has got to be one of the best - it crams in so many features! You can read more about the project on this electro-music.com thread (I've shared the front panel design file on page 8 and there's a demo mp3 there too).
A brief overview of the features: There are three sections which together make up a synthesized drum -- Impact (a short impulse like the beater hitting the drum), Shell (the main body of the drum) and Noise. Each section has its own decay control - these are all fired by the main Trigger Input. The Impact is a pretty simple Squarewave and the Noise is white noise passed through a voltage controlled resonant filter (low-pass or band-pass). Its the Shell section that really packs in the features -- its based on the XR2206 chip, outputting a triangle wave, and its basic freq. range is massive - I measured 25Hz right up to 19kHz! But, on top of that Thomas Henry has added a wonderful RingMod osc allowing really great tones. Just like that things'd be great, but you also get CV modulation for the Noise and Shell (which can actually be cross-modulated with the Impact or Noise outputs) and the great LockMode - this holds all the Envs open, giving you a wierd and wonderful synth voice!
PCBs will be being made available pretty soon for this project once some more testing has been done -- check back to the electro-music thread for further details.
As you can see there's quite a lot of wiring to be done! It was quite a squeeze to fit everything into a 3-frac-width panel, but I'm happy to have such a powerful module in such a compact form.