via this auction
"This is a very rare pre-production version of an obscure, but amazing-sounding 2-VC0 analogue synthesizer that was handmade in very limited quantities in Hastings in the UK. There's no box, but has a downloaded manual and is in very good condition. This prototype has the beautiful metal ends that were replaced on the production version by not so nice white thermo-moulded plastic. This means the end cheeks are not labelled on this machine, but the controls there are just CV; gate; tuning; volume; external input; and power input.
This may appeal more to a collector given its somewhat eccentric design, but capable of very raw and powerful sounds, particularly if you like Radiophonic-style music or vintage EMS-style sounds. See Cuckoo and Automatic Gainsay clips on Youtube for a good demonstration of what it can do.
The S2 can be played from its own Wasp-like keyboard (by hand or stylus, included) or controlled via CV/gate. I ran it with a Roland A-01 for MIDI control, but any standard MIDI-CV converter such as a Kenton would do the job."
