A bi-timbral analog synthesizer with a 37-note keyboard. Released in 1979.

The Sigma contains two separate 1-VCO parts, synthesizer and instrument. They can be layered for a thicker monophonic sound.
Low- and high-pass 12dB/octave VCFs are available, as well as a sine wave LFO. The VCA offers a simple attack/decay envelope. Other features include a ring modulator and a noise generator.
11 preset sounds are offered, with no patch memory for user sounds. Controls include two joysticks; one for pitch / vibrato and other for the filters. CV / trigger interface is included for external control.

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