Title link takes you to more. Via Frank Vanaman. Update: Looks like Carbon111 beat me to it
on Synthwire! I was wondering when this would happen. : ) Oh well, the more the merrier in my book.

"I call it the Sonic Emulsifier, a name coined by someone at work who knows nothing of analogue synthesis or sound processing."
"The History:
It started out with a WersiVoice card, which is basically a triple BBD contraption that was very commonly installed in Wersi organs, that gives both ensemble and rotary speaker effects, and, for its time, was actually pretty decent sounding. What it turned into:
(1) the Wersivoice BBD device
(2) a Ken Stone bandpass filter (SH-5 Bandpass clone)
(3) a Ken Stone Real Ring Modulator (two transformers, four diodes)
(4) a Paia “Roctave divider” board
(5) a multi filter band pass unit tuned to vocal frequencies (based on the VP-330 filters)
(6) a 566-based VCO using Thomas Henry’s schematics
(7) a 4-in, 1-out DC mixer, and
(8) a 4-way mult
The VCO is there basically so that if you want to use the ring modulator with a single input, there’s something there to modulate with. It’s a strange assortment of things, some of which are included because I happened to have the boards sitting around (like the PAiA Roctave).
I couldn’t resist the desire to make something that looked “technical’ from the front. The big central dial is the main frequency control for the oscillator. Pots to the upper left control the PAiA divider; pots to the right are for the mixer, the oscillator has an output attenuator control (left of the big dial) and a wave-shape sweep control (to the right of the big dial). Switches at the bottom left select the Wersivoice modes, switches to the bottom right control the selection of groups of filters in the vocal filter matrix.
Nothing’s blown up yet, so I’m assuming I’ve managed to put it all together right the first time.
MP3s? Eh, eventually…"
Frank