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Quantization is used to constrain a control voltage to discrete steps. The module takes the amplitude of the input voltage and breaks it down into the steps specified by the voltage on the Step Size control plug. Quantization is used on control voltages for pitch an filter cut-off voltages. (No reason why you can’t apply it to audio, but the correct module for audio is a Bitcrusher which gives you better control). Quantization is often used for generative and ambient music.
The Synthedit Quantizer will work on Audio signals, and progressively reduce a sine wave signal form the original sine wave, through a stepped sine wave to a pulse waveform, which is quite different in effect from a bit-crusher (bit reducer).
Note: all a quantizer will do when applied to audio is to introduce distortion, it does not introduce any frequency changing or shifting effects.

The SynthEdit quantizer module

Plugs.
Left Hand Side:

Signal In:- (Voltage) Control Voltage Input signal
Step Size:- (Voltage) Quantisation step size in Volts

Right Hand Side:

Signal Out:- (Voltage) Quantized Control Voltage output.

The screenshot below shows the effect of quantizing a +/- 5 Volts sine wave. Note: In some cases the peak-to-peak voltage of the output will actually be greater than the =/- 5 Volts input to accommodate the correct voltages between each step.

What the quantizer can do