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Oberheim 4 Voice

Polyphonic Analog Synthesizer

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Oberheim 4 Voice
Oberheim 4 Voice
4 000.00 street price

4 Voice is a semi-modular analog polyphonic synthesizer, assembled and based on the four SEM modules. Thus, the synthesizer incorporated eight voltage-controlled oscillators (VCO), two per voice, four controlled filters, four VCA and ADS envelope generator.

Each module is configured individually, which can create some inconvenience (it is mildly impossible to quickly change the settings of four modules at the same time having only two hands), but it actually allows creating very complex sounds and chords with unusual sonic flow.

The synthesizer included a dual eight-step sequencer and a mixer module, allowing to set the volume and pan position for each voice.

In 1976 the PSP module was added to the synthesizer. It simplified the control significantly, and allowed saving the settings of the synthesizer in 16 presets.

4 Voice was used in the compositions of 808 State, Chick Corea, Styx, Human League, Pink Floyd, Stevie Wonder.

Country of origin / production: USA

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More info
Usage area
Usage Design/ Form Factor
With Keys 
Analogue (A) 
Analog Voices4
Tone Generator / Sound Synthesis
Oscillator Type VCO (Voltage Controlled Oscillator)
Oscillators per voice8
Waveform/ Spectral form (main generator) Pulse Width Modulation (PWM)
Waveform/ Spectral form (main generator) Saw
High-pass Filter (HPF) 
Low-pass Filter (LPF) 
Band-pass Filter (BPF) 
Band-reject Filter (BRF/ BEF) 
Envelope Generator (EG)
Parts count2
Step Sequencer 
Max Step Count8
Arpegiator/ Portamento
Type Synth Action
Number of Keys49
Audio out
Analogue: 1/4" (6.35mm)2
Analogue: 1/4" (6.35mm) headphones preamplified2
Voltage 110V
Voltage 60Hz
Power Supply Built-in, internal
Case/ body
Production start1975
Production end1979
Production ended

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