via this auction
"Monophonic analog synthesizer released in 1979...
The CS-20M features 2 VCOs with a 6-octave range and 3 waveforms. The VCA contains an extra sine-only oscillator, and a white noise generator is also included.
Like on the other early CS-series synths, a resonant 12dB/octave multimode VCF is available as the filter. It is switchable between high-, low- and band-pass (the last being 6dB/oct). The VCF contains its own ADSR envelope generator plus controls for cut-off and resonance.

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