above photo from the collection of Daniele Marziali

The SX2000 is a monophonic synth with 7 presets, designed to sit on top an organ, which explains its drawbar-like sliders. Its controls are in front of the keyboard, also to provide easy access from atop an organ. The SX2000 features a single VCO, switchable between four octaves (32', 16', 8', 4') and four waveforms (sawtooth, square, and two rectangular waveforms). Portamento is also available. The VCF has controls for cut-off frequency and emphasis (resonance). Both the VCF and VCA are switchable between three preset envelope settings, repeat (which constantly repeats AD envelope), ASR (with sustain), and AD (without sustain), with knobs for attack and decay/release. The LFO is switchable between square or triangle waveforms, with sliders for intensity and speed. The LFO can control the VCO or VCF. Available presets are synthy, harpsichord, flute, clarinet, violin, trumpet and piano.

[from The A-Z of Analogue Synthesizers, by Peter Forrest, published by Susurreal Publishing, Devon, England, copyright 1994 Peter Forrest]