via this auction
"Up for sale is a (1) very rare RSF Blackbox, family of the RSF Kobol. It's a 18 keys synthesizer made in the seventies by Ruben and Serge Fernandez in France. The synthesizer works perfectly! Optical it looks ok for it age, the wooden sides are a bit damaged and there are some minor scratches on it (see photo's). It comes with a printed owner's manual. It's a 220V version and the serial number is: 13282.
The Blackbox can turn your analog monophonic synthesizers into polyphonic by the use of CV/Gate with both type of voltage source as CV Volt/Oct and/or Hertz Volts and both gate types as positive gate (V-Trigger) or negative gate (S-Trigger).
So basically you can control & use every kind of analog synthesizer with this unit like Korg, Roland, Yamaha, Kawai, Sequential Circuits, Moog, ARP, Oberheim, Other RSF, Etc..."
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