1981 Sequential Circuits Pro One Model 100 Vintage Analog Monophonic Synthesizer w/ Cover

Up for sale, a 1981 Sequential Circuits Pro One Model 100 monophonic analog synthesizer in exceptional condition and in perfect working order. Introduced in 1980, the Pro-One was designed to be a smaller, simpler version of its renowned elder, the Prophet-5.Considered one of the most monolithic of vintage monophonic synths, the Pro One can generate many of the same sounds as the Prophet-5 and Prophet-10, capable of supremely punchy bass lines and distinctly ripping leads, fueled by two VCOs, referred to as Oscillator A and Oscillator B. These VCOs and white noise can be mixed into the resonant low-pass VCF filter. The filter modifies the voice timber under control of its four-stage envelope generator, and the filter may also serve as a sound source. This stage is followed by a voltage-controlled amplifier (VCA), which shapes the voice amplitude, also under control of a four-stage envelope generator.The Pro One has extensive modulation provision with three modulation sources available, featuring Filter Envelope Generator, Oscillator B, and a separate LFO. Each can be mixed and routed for either Direct or Wheel-controlled modulation.In addition to possessing the Prophet’s core sound and all of the essential monophonic synth features, the Pro One includes a 40-note sequencer, an arpeggiator, Pitch and Mod wheels, Repeat and Drone switches, keyboard modes such as Single or Multiple-triggering, and the unique Automatic Glide.This Sequential Circuits Pro-One Model 100 is remarkably well-preserved, with nigh flawless silkscreened graphics and all original knobs and switches intact. The wood sides show sparingly little wear and the serial number and original factory warranty stickers are intact on the back of the enclosure.A fitted cover is included.