Doof is a drum module. The topology is common enough in many drum synths: Trigger circuit, envelope follower, VCO VCA, but the actual sub-circuits are slimmed down versions of the dual OTA VCO and VCA from the Matrix Mixer.
Very wide ranging and shape control squares up the waveshape to get a nice raspy rattle to the sounds.

This is the original version of the module with one CV input.

On Demand Info

These kits and assembled modules are offered on demand, click the link to learn more.