Siel Keytek CTS 2000 Analog / Digital Synthesizer

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The Keytek CTS 2000 was still produced by Siel before the company was forced to close in 1987 and was partially merged into the new Keytek brand. It is a digital synthesizer with analogue resonant filters.

The Keytek CTS 2000 has a keyboard with 61 keys, 8 voices and for each voice two oscillators with three waveforms and two-stage envelopes to crossfade between them. Each oscillator has its own detune page with tuning parameters and simple pitch envelopes. There are a 6-stage amplitude envelope for each oscillator, a resonant 4 pole low pass VCF with another 6-stage envelope and 3 LFOs, 2 dedicated to the oscillators and the third to the filter/VCA. Waveforms are saw, triangle, square, and random. The third LFO can be routed to the filter and/or the VCA, the pitch wheel depth be set independently for each oscillator, velocity can control the oscillator level and VCF envelopes independently. There's a menu for mono mode and monophonic portamento, a level control, a fixed panning control, various copy functions and a dynamic voice allocation. (source: geocities)