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ARP Omni Orchestral String Ensemble

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    Description
    The Omni featured preset, electronically generated Orchestral ensemble String voices including polyphonic Violin and Viola sounds as well as monophonic Bass and Cello. The instrument also included a monophonic Bass Synthesizer section and a polyphonic Synthesizer section. The Synthesizer section featured a 24 dB/oct Voltage-Controlled Low Pass Filter (LPF); an ADSR envelope generator and a single waveform (triangle) Low Frequency Oscillator (LFO) were both routed to control the VCF Cutoff frequency. A Waveform Enhancement switch allowed selection of a square wave voice waveform vs. the default quasi-sawtooth waveform. The ARP Omni had a unique logo that was painted on to the back face of the unit.

    The String and Synthesizer sections of the 49-note Omni utilized the Mostek MK50240 Top Octave generator IC along with divide-down circuitry; as a result, these sections were fully polyphonic, as opposed to subsequent polyphonic synthesizers such as the Sequential Circuits Prophet-5 and Yamaha CS-80 which featured dynamically allocated, limited polyphony of 5- and 8-voices respectively (although these units featured a far more comprehensive and complex synthesis architecture).

    The three sections of the Omni - Strings, Synthesizer, and Bass - were all simultaneously available and mixable; the String and Synthesizer sections featured separate audio outputs on the rear panel of the unit which allowed separate amplification and signal processing of these sections for stereo effects. The Omni was single-oscillator in nature; normally, the String section alone was processed through the on board, patented ARP 3-voice Chorus Phaser circuit, producing the lush, moving sound the instrument is most known for. However, the Synthesizer section was processed through this circuit when a front panel "Chorus Phaser" switch was activated, simultaneously summing the String and Synthesizer section outputs and slowing the Chorus speed.
    Images
    Architecture
    Type: Analog
    Synthesis: Subtractive
    Oscillators
    Oscillators: 1
    Waveforms: Pulse, Saw Up
    Osc Modulation: After Touch, Keyboard, LFO
    Oscillator Notes:
    Tones: Viola, Violin, Polysynth: Bass/Cello, Bass Synth
    Envelopes
    Envelopes: 2
    Evelope Paramerters: Attack, Decay, Sustain, Release
    Envelope Notes::
    Strings: AR
    Polysynth & Bass: ADSR
    Filters
    Filters: 1
    Types: 24dB Slope (4-pole), Low Pass
    Filter Modulation: Keyboard, LFO
    LFO
    LFO: 1
    LFO Parameters: Triangle
    Polyphony & Tuning
    Polyphony: 49
    Timbrality: 3
    Tuning: Standard
    Patches
    Patches RAM: 1
    Editing: CV
    Case
    Case: Keyboard
    Keyboard: 49 keys, Non-weighted, Plastic
    Controls: Faders
    Weight: 33 lbs
    Connections
    Audio Output Connections: 1/4" Phone Jack, Mono Out
    CV Ports: CV IN, Gate In
    Power: 120 V AC
    Pricing
    List: $2,450
    Retail: $2200
    Used: $300 - $600
    Production
    Released: 1975
    Discontinued: 1980
    Units Made: 4,000
    Used By
    The Cars, Joy Division, The Spines, Kansas, Modern English, Tangerine Dream, Exodus, Billy Joel, Prince, Electric Light Orchestra,
    Manuals & Documents
    Reviews
    Repairs and Support
    [+] syntaur.com

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