Audio Path
The Polysix had a straightforward synthesis architecture. Each voice had one oscillator with sawtooth wave, variable pulse wave, or PWM outputs. The PWM section had its own LFO. In addition, there is a sub-oscillator that allows the addition of a square wave either one or two octaves below the main VCO pitch.
The filter has controls for cutoff frequency, resonance, envelope amount and keyboard tracking. The envelope control has a center zero, letting the user select either a normal or an inverted envelope. The envelope is an ADSR type.
The VCA can be operated from either the envelope or a gate signal.
The mixed sound of all the voices can be sent to an effects section, which offers three modulated delay-based effects (Chorus, Phase or Ensemble setting). This acts to fatten the sound considerably, and was a key feature at the time of release.
Read more about this topic: Korg Polysix
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