Yamaha SK-20 – 1979
Available for sale
7-voice polysynth and string + Full FM organ + monosynth
One VCO, two in polysynth section
One with Sine waveform only (leslie simulator - 2 speed)
Brilliance control, Resonant low-pass 12dB filter (non-self-oscillating)
rocker switches for attack and sustain
Vibrato, Tremolo and Ensemble effects for the organ and poly synth string sections.
61 keys (122 keys on SK-50D)
No user memory. 3-preset patches per section.