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Sequential Prophet Prophet 5

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    The Prophet-5 actually contains five individual synthesizers, termed 'Voices." For its principle sound sources, each voice contains two voltage-controlled oscillators (VCOs), referred to as OSC A and OSC B. OSC A, OSC B, and a white noise source can be mixed into a resonant low-pass voltage-controlled 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. Following each filter, a voltage-controlled amplifier (VGA) also controlled by a four-stage envelope generator shapes the voice amplitude. Only one voice is depicted on the control panel, because the voice controls "patch" the five voices identically. This makes the voices homophonous—they sound alike—with pitch differences corresponding to (at most) five simultaneously-held keys.

    Supplementing the basic voice are polyphonic modulation (POLY-MOD) signal routings
    within each voice that allow OSC B and the filter envelope generator to function as modulation sources applied to OSC A frequency or pulse width, or to the filter frequency. Finally, there is a single low-frequency oscillator (LFO) and a pink noise source which can be mixed to modulate all five voices, as adjusted by the modulation (MOD) wheel. The PITCH wheel raises or lowers the pitch of all voices by the same

    The term "digital-analog hybrid" is often used to describe the Prophet. This means that instead of directly controlling the analog synthesizer voices, the keyboard and most controls are actually devices which input "data" to a microcomputer system which in turn "programs" the voices. The microcomputer system has three main functions. First, it solves the problem of generating five independent sets of voice control voltages and gate signals (which operate the envelope generators) from a single keyboard. Second, its digital memory provides a way to store all of the switch and knob settings which form a program. These programs are retained by the microcomputer memory even when the Prophet is turned off, thanks to a small battery with a 10- year life. Third, the microcomputer system keeps the ten voice oscillators in tune.

    Accessories specifically designed for the Prophet-5 include the Model 1005 Polyphonic Sequencer which allows direct storage of lengthy keyboard sequences, and the Model 1001 Remote Keyboard. For increased performance flexibility, the Model 8 Analog Interface Adapter enables remote control of the PITCH and MOD wheels by two Model St^O Voltage Pedals.

    Type: Analog
    Synthesis: Subtractive
    Oscillators: 2
    Waveforms: Pulse, Saw Down, Saw Up, Sine, Square, Triangle
    Osc Modulation: Envelope, Keyboard, Knob, LFO, Mod Wheel, Oscillator, Pedal, Pitch Wheel, Ring Modulation
    Envelopes: 2
    Evelope Paramerters: Attack, Decay, Sustain, Release, Monophonic
    Filters: 1
    Types: 24dB Slope (4-pole), Low Pass, Resonance
    Filter Modulation: Envelope, Keyboard, LFO, Mod Wheel, Pedal
    LFO: 1
    LFO Parameters: Sample & Hold, Saw Up, Saw Down, Square, Triangle
    LFO Notes::
    Dedicated LFO to modulate the pulse width or pitch of oscillator A
    Polyphony & Tuning
    Polyphony: 5
    Tuning: Micro, Standard
    Patches RAM: 120
    Patches ROM: 120
    Editing: CV, MIDI
    Optional SCI Model 800 Digital Poly Sequencer

    When connected to a Model 800, the Prophet devotes its fifth voice to the
    sequencer: Voices 1, 2, 3, and <* may be played "live" while the sequencer is controlling
    Voice 5
    Chips and Operating System
    Rev 3.3
    Case: Keyboard
    Keyboard: 61 keys, Non-weighted, Plastic
    Controls: Knobs, Switches, Mod - Wheel, Pitch -Wheel
    Display Notes: Alphanumerical
    Dimensions (WxDxH): 37 x 4 x 4
    Audio Output Connections: 1/4" Phone Jack, Mono Out
    Audio Output Count: 1
    CV Ports: CV IN, CV OUT
    Year Released: 1978
    Year Discontinued: 1984
    Used By
    David Sylvian, Tangerine Dream, Weather Report, Skinny Puppy
    Manuals & Documents

    Product Links
    Company Product Sites:
    [+] winecountrysequential.com
    MSRP List Price: $3,995 - convert
    Used Price: $3,700-$5,000 - convert
    YouTube Videos
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