via this auction
"The Deerhorn is a fantastic Theremin-like instrument by Peter Blasser / Ciat-Lonbarde. The Deerhorn organ is made up of three of these Deerhorns.
Each Deerhorn has an antenna, the circuit boards in the photo by the knobs and jacks, two oscillators, and two VCAs. The distance of your hand and rate of approach or leaving from the antenna control the volume of a VCA (one VCA for motion toward the antenna, another VCA for away. The VCAs then go to a stereo 3.5mm jack, which gives a stereo feel to the instrument). That control voltage is also available at the orange jack. It can be patched into the purple jacks to control the pitch. There are other jacks, and wonderful cross modulation possibilities exist.
This is the older style unit (no audio input).
I added a ground banana jack, it's on the back, near the audio output, in line with the 3rd Deerhorn's antenna. It works perfectly. I should say that I had to repair one of the tuning capacitors in one of the Deerhorns after it broke while I was calibrating it.
More info here: http://ciat-lonbarde.net/plumbutter/index.html -- search "deerhorn" or the description is about half way down the page."
