X

The amplitude multiplier module X is multiplying the two applied input voltages X in and Y in. A multiplication of 2 both positive or both negative input voltages will result in a positive output voltage, while a multiplication of 1 negative and 1 positive signal input will generate a negative output signal (phase inversion). The results are ring/amplitude modulated sounds or control voltages.

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One of the input, X in, is equipped with several manual control options: A switchable exponential converter for VCA-like applications etc.; a Level knob to amplify or attenuate the input signal, an inversion switch and an adjustable Offset voltage, which can be added to this input. The offset knob is also allowing a ‘dry/wet’ style control over the Y input and the modulated signal, or may be used to shift the multiplier’s working point. In addition, there is a little red LED indicating when this input is becoming overdriven.
In comparison with the 1st input X in, the 2nd input Y in has no extra features or controllers – to reduce the complexity and keep the handling more simple.
The output (W out) is internally attenuated to ensure that the product voltage of X×Y is almost in the range between the ±12V voltage supply.
4-quadrant means: In comparison to a common VCA (2-quadrant operation), a multiplier is processing both positive and negative (control) voltages, causing a ± polarity inversion of the modulated signal for input voltages with unequal polarities (≙ 4-quadrant operation).

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