via this auction
"Hard to find vintage RSF Blackbox polyphonic synthesizer, made in France by Ruben Fernandez. The synth is working fine and we include a copy of owner's manual in pdf. Notice that the owner's manual is written in French.So, this is how this synth works: plug a mono source into the input of the Blackbox and it will take the input waveform and allow you to play chords with it, effectively turning a mono source into a polyphonic output. It also has its own internal oscillator, so it can generate polyphonic sound all by itself. You can lock a chord on the Blackbox and then vary the pitch of the mono input, thereby changing the root pitch of the output chord. Additional controls allow you to add an additional tone either one or two octaves below the input, as well as adjust chorus.
Optically the synth is in good condition with minor signs of use. The wooden side panels have little wear and tear and some small scratches. On the metal case you'll find some small scratches too. All the lights above the keys are working fine.
It's an originally 220v version with European plug installed to the lead. The serial number is: 13334"
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