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Sequential Circuits Pro One

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The Pro-One is a monophonic (one-voice) keyboard synthesizer. Its principal sound sources are two voltage-controlled oscillators (VCOs)j referred to as OSC A and OSC B. OSC A, OSC B5 and a white noise source can be mixed into the resonant low-pass filter (VCF). The filter modifies the voice timbre under control of its four-stage envelope generator. 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 keyboard provides frequency control voltage (KYBD CV) for the oscillators and filter, and generates a GATE which controls the envelope generators. In addition to this basic voice, the Pro-One has extensive modulation provisions. Three modulation sources are available: the filter envelope generator (FILT ENV), OSC B, and a separate low-frequency oscillator (LFO). Each can be mixed and routed for either DIRECT or WHEEL-controlled modulation of five destinations: OSC A frequency (FREQ), OSC A pulse-width (PW), OSC B FREQ, OSC B PW, and filter frequency (FILTER).

This complement of analog synthesizer modules and the routings provided for their interconnection have been well-proven in the Pro-One's ancestors, the Prophet-5 and Prophet- 10 polyphonic synthesizers. Besides allowing the synthesist to play up to five or ten notes at one time, these two instruments contain microcomputers which program all the control settings comprising a sound. The Pro-One is neither
preset nor programmable: you always "patch" the precise sound you want with the knobs and switches on the control panel. But the Pro-One voice itself is identical to a single Prophet voice, so it is capable of as much range and expression.

Possessing the Prophet's sound and all standard monophonic synthesizer features, the Pro-One's own microcomputer makes possible innovations unheard of on a low cost synthesizer; a ^0-note sequencer, an arpeggiator, keyboard modes such as single- or multiple- triggering, and the unique automatic glide feature. An audio input with preamplifier and automatic GATE generator allows synthesizer processing
of low-level inputs such as a microphone or electric guitar. The audio output can drive a monophonic or stereo amplifier, or stereo headphones.
Of special interest to computer enthusiasts, the Pro-One readily interfaces for control by an external microcomputer. This manual contains all the information you'll need to fully enjoy this outstanding instrument.

Technical Specifications
Type: Analog, Digital
Oscillators: 1
Waveforms: Pulse, Saw Down, Saw Up, Square, Triangle, White Noise
Osc Modulation: Envelope, Keyboard, LFO, Mod Wheel, Oscillator, Pitch Wheel, Glide / Portamento, Sequencer
Envelopes: 1
Evelope Paramerters: Attack, Decay, Sustain, Release
Filters: 1
Types: 24dB Slope (4-pole), Low Pass, Resonance
Filter Modulation: Envelope, Keyboard, Knob, LFO, Mod Wheel, Oscillator
LFO: 1
LFO Parameters: Saw Up, Saw Down, Triangle
Polyphony & Tuning
Polyphony: 1
Tuning: Standard
Modes: Mono
Patches RAM: 1
Storage: Internal, 6
Editing: CV
UP/DOWN patterns, Latch mode;
SEQUENCER: 2 patterns of pitch info only, 40 note capacity
Case: Keyboard
Keyboard: 37 keys
Controls: Modulation - Audio Input, Mod - Wheel, Pitch -Wheel, Sequencer, Pedal - Sustain, Switches, Tempo Knob, Pedal - Volume
Dimensions (WxDxH): 653 x 417 x 130 mm
Weight: 7kg
Audio Output Connections: 1/4" Phone Jack, Mono Out
Audio Output Count: 1
Inputs: 1
Year Released: 1981
Year Discontinued: 1984
Used By
New Order, Mouse on Mars, Prince, Soft Cell, Richard Barbieri
Manuals & Documents

Product Links
Company Product Sites:
[+] winecountrysequential.com
Used Price: $800-$2,000 - convert

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