This SK20 is fully functional and in good cosmetic conditon with some light fading to the control panel.
The SK20 is paraphonic synth with 3 sections; The Organ, String, and Polysynth section. At it's heart is a divide-down based polyphonic oscillator section with 3 character sections. The Organ section gives you various interval footage drawbars, and the Polysynth offers a Low Pass filter and ADSR, while the String section gives you 2 preset voice settings to choose from. The different voices can be mixed and played simultaneously, or split, and can all be passed through the Tremolo and Ensemble effects.