Sequential Circuits Prelude SN 171/193

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via this auction

You can find a demo of one, linked in the auction, posted here.

"This thing sounds cool - the resonance, chorus, and flange let you get otherworldly sounds out of it.
I tried all the switches, faders, and buttons, and they all seem to work to my ear. When I encountered a scratchy sounding fader, contact cleaner was able to clean up the sound. I am not a tech, so it is sold "as is".

This synth is great! It's four voices: Brass, Piano, Organ, and Strings... Each section can be manipulated by the various sliders. Too many to name. It's got a Modulation section and an Equalizer section as well as a section of Effects like: Octave, Chorus, Etc... It's a simple machine, but it's very capable of producing FAT bass sounds. I mean really FAT.

'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.

The Prelude is a 4-section orchestral synthesizer consisting of Piano, Organ, Brass and String sections. Like many other similar 4-section synths of this type, all 49 keys will play simultaneously for 49-note polyphony. Two of the sections can be played at the same time. It has an on-board chorus/flanger effect as well as a 7-band equalizer. The string sounds are the best feature of the Prelude, and the on-board effects and EQ are great for thickening and modulating the string sound beyond the scope of traditional orchestral sounds. The Prelude has a very appealing and intuitive Sequential-esque layout and appearance and is definitely one of the finest orchestral-type multitimbral synths among others in its class.'"