From an auction, via matrixsynth:

Under the racked Minimoog, under the cat.

“This is a very rare Hohner S4 string synthesizer. I have found no information about this item anywhere. Is it a prototype? I don’t know. I do know its a cool paraphonic divide-down synthesizer with “cello” and “strings” sections. Two release modes, fast decay and slow decay. Three octave select buttons. Here is the sound. I am guessing it was manufactured in the mid-to-late 1970s. It operates like it should. Cosmetically, it looks fair for an instrument that has obviously been gigged. The tear in the tole on one of the close-ups has been glued. I will ship carefully, in two boxes, as it has a heavy, boat anchor style power supply with a volume pedal. Here’s the only audio sample I have of it. Sorry, its half-way in.

“https://soundcloud.com/isopod/isobot-1wip“