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Oberheim | 4 Voice
A big step forward after the initial Oberheim SEM and Two Voice synthesizers came from the bigger and better Four Voice. Four dual-oscillator SEM modules each with its own filters and envelopes are joined together along with a simple analog mixer and 49-note keyboard to give you a polyphonic/polytonal Obie-beast!
This combination gives you eight oscillators and four voices of polyphony because there are basically four discrete mono-synths all connected together. This has its pros and cons. What is cool is that this was a lot of simultaneous voices for the mid-seventies. And the ability to craft a different sound on each voice led to some diverse and complex sounds. However, it also meant you have to program each voice independently. Each voice also has its own independent audio output.
The Polyphonic Synthesizer Programmer, released in 1976 and added to the Four Voice stores 16 patches per voice (all of which can be different). The Four Voice could accommodate an additional four SEMs, making it just like the Eight Voice model which officially appeared in 1977.
Unfortunately the Four Voice was blown out of the competition by the release of the polyphonic Sequential Prophet-5, which offered true polyphony with a single set of sound shaping controls and comprehensive patch memory.
|Engine Detailed||2 VCO's (per voice) with sawtooth or variable-pulse waveforms|
|Filter (VCF)||Low, band, high, notch filter w/ resonance|
|Envelope (VCA)||2 ADR (Attack, Decay and Sustain) Envelope Generators|
|Sequencer||Mini Sequencer (with 8 steps and 4 voices)|
|Extra info||Optional to stack another 4 voice to make it basically an 8 Voice.|
|Produced:||1975 - 1979|
|Legend:||Obvious||Y: Yes, N: No, N/A: Not Applicable|
|VCO||Voltage Controlled Oscillator||DCO||Digital Controlled Oscillator|
|LFO||Low Frequency Oscillator||Sub||Sub Oscillator|
|VCF||Voltage Controlled Filter||VCA||Voltage Controlled Amplifier|
|Velocity||As with a piano, the harder you hit a key, the louder the sound, unlike most organs which always produce the same loudness no matter how hard you hit a key.||Aftertouch||Pressing a key after you activated it. Channel Aftertouch, no matter which key, it will send a Channel message. Poly Aftertouch, sends the pressure per key instead of the whole channel.|
|Values for OSC, LFO, Filter, Envelope are per voice unless stated otherwise.|