(Used) Yamaha SK30 Keyboard Synthesizer

Yamaha's SK-series are combo-keyboards with synthesizer, organ, brass and string sections. The SK-30
was released in 1980.

The ORGAN SECTION is available in all the SK series synthesizers. It offers a full range of stop levers from 1' to 16', percussion levers with adjustable decay, and controls for overall sustain, brilliance and decay. This gives quite a lot to work with in the way of synthesis. The organ's sound is FM based. You can add a Vibrato and a Tremolo to it. It also has a Leslie-speaker output around back.

The SK30 (weighing in at over 90 lbs.) also feature a SOLO SYNTHESIZER SECTION which is a single VCO driven mono-synth. It has basic pitch, waveform, filter, volume, envelope generator and portamento functions. Its resonant filter isn't great and can't be driven into self-oscillation. The keyboard's after-touch can control the vibrato, tremolo, and brilliance effects. You can effectively play leads in the solo section while simultaneously playing chords in the string, organ or poly-synth sections.