Yamaha SK-20 – 1979

Polyphony

7-voice polysynth and string + Full FM organ + monosynth

Oscillators

One VCO, two in polysynth section

LFO

One with Sine waveform only (leslie simulator - 2 speed)

Filter

Brilliance control, Resonant low-pass 12dB filter (non-self-oscillating)

Envelopes

rocker switches for attack and sustain

Effects

Vibrato, Tremolo and Ensemble effects for the organ and poly synth string sections.

Keyboard

61 keys (122 keys on SK-50D)

Memory

No user memory. 3-preset patches per section.

Control

CV-Gate IN/OUT

Date Produced

1979-1980