via this auction
"Simmons SDSV analog drum synth brain with two sound modules/cards, Bass and Snare.
The Simmons SDSV was introduced in the late 70s and can be heard on many popular recordings of the 80s. The SDSV drum brain could hold up to 7 analog sound modules. Two modules, Bass and Snare, are included with this auction.
Each sound module has a factory preset, and 3 user adjustable presets that can be recalled using the four square push-buttons on each of the sound modules.
PLEASE READ: There are some minor scratches and corrosion on the exterior of the SDSV brain as shown in the photos. Otherwise the SDSV is in good shape for its age.
...recordings of the Simmons SDSV in this auction here: http://www.box.net/shared/041jerrgs0
You can view and download the Simmons SDSV Operation Manual here: http://www.box.net/shared/kup0rio0qp
You can read more about Simmons SDS-1 on the web here:
http://www.simmonsmuseum.com/?area=devices&view=details&id=4
http://en.wikipedia.org/wiki/Simmons_SDS-V"