A monophonic analog synthesizer with a 37-note keyboard. 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.

The single LFO can be used for PWM. An internal memory is available, holding up to 8 user programmable patches. Other features include brilliance control, portamento, pitch bend, glide and glissando. For external control there is a CV/gate interface.
 width: 849mm
height: 177mm
 depth: 455mm
weight: 16kg 

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