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Rare 1983 sequential circuits siel prelude analog synthesizer - $600 (Oakland)
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From 1983 Ad: "Sequential Circuits introduces the Prelude, a polyphonic keyboard instrument with string, brass, piano, and organ sounds, all of which can be mixed together if desired. Each instrument section also has three different tone colors that can be mixed. A modulation section allows for flanging, chorusing, vibrato, and delayed vibrato from an LFO. The brass section includes filter cutoff and resonance and attack time controls. the decay time can be controlled in the piano section, and attack and release times are controllable in the string section. the instrument also features a built-in five-band graphic equalizer. A rear panel input jack allows an external signal to be processed by the equalizer and the chorus effect."
https://reverb.com/item/94893883-sequential-prelude-paraphonic-ensemble-synthesizer-aka-siel-or-400-orchestra-2?bk=