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Sequential Circuits Prophet 10

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Although each voice is keyed independently, all five voices in each polyphonic bank function from the same patch setting, and are therefore homophonous. However, each of the two 5-voice synthesizer banks can operate on a completely different program, and can be articulated independently via the two keyboard manuals. In other words, two different programs can be used at any one time. One is the UPPER program, with one 5-voice synthesizer usually tied to the upper keyboard, and the other is the LOWER program, with the other 5-voice synthesizer usually tied to the lower keyboard.

Each synthesizer voice consists of two voltage-controlled oscillators (VCOs), a white noise source, a resonant low-pass voltage-controlled filter (VCF), a voltage-controlled amplifier (VCA), two envelope generators (one wired to the VCF and one wired to the VCA) and a 3-band equalizer (EQ). In addition, there are routings (via the POLY-MOD section) that allow for oscillator B and the filter envelope generator lo lunction as modulation sources which can be applied to the frequency or pulse-width of oscillator A, or the filter frequency. Finally, each 5-voice synthesizer bank has a single LFO which can be applied to all of its voices for various effects. The two LFOs (UPPER and LOWER) can also be combined (summed) and applied to both polyphonic synthesizers for other effects.

The Prophet 10 also contains a microcomputer, which serves several purposes: it determines which voice is assigned to which key, it keeps the voices in tune, and (most importantly) it remembers preset voice patches which may be instantly recalled to program the voices. These preset programs are retained by the micro computer's memory even when the Prophet is turned off, thanks to a small battery with a 10-year life.

Technical Specifications
Type: Analog, Digital
Synthesis: Subtractive
Oscillators: 2
Waveforms: Saw Down, Saw Up, Square, Triangle
Osc Modulation: Envelope, Glide / Portamento, Keyboard, Knob, LFO, Mod Wheel, Oscillator, Pitch Wheel
Envelopes: 1
Evelope Paramerters: Attack, Decay, Sustain, Release
Filters: 1
Types: 24dB Slope (4-pole), Resonance
Filter Modulation: Envelope, Keyboard, Knob, LFO, Mod Wheel, Oscillator, Pitch Wheel, Portamento, Sequencer
LFO: 1
LFO Parameters: Saw Up, Saw Down, Square, Triangle
Polyphony & Tuning
Polyphony: 10
Tuning: Standard
Modes: Polyphonic
Patches RAM: 32
Patches ROM: 32
Storage: 6
Editing: CV
Digital Poly Sequencer 6 tracks (4,000 to 10,200 notes)
Case: Keyboard
Case Details: 2 x 61 key keyboards
Keyboard: 61 keys
Controls: Buttons, Knobs, Switches, Mod - Wheel, Pitch -Wheel, Pedal - Sustain, Pedal - Volume
Display Type: Numeric
Display Notes: 2 x Aplhanumerical displays
Audio Output Connections: 1/4" Phone Jack, XLR, Mono Out
Audio Output Count: 3
Year Released: 1980
Used By
Tangerine Dream, The Orb, The Human League, Vangelis
Manuals & Documents
Used Price: $7,500 - convert

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