X

 The X is a versatile 4-quadrant multiplier module usable for ring modulation, VCA, waveshaping and much more.
The two input voltages ‘X in‘ and ‘Y in‘ are being multiplied together, resulting in the multiplication product voltage ‘W out‘ (which is internally attenuated to keep the signal within the working range).

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If audio signals are being used for both inputs, the result will be a ring modulation. If a CV is applied to one input and an audio signal to the other one, the CV will control the amplitude of the audio signal (like a VCA) or will invert it (if the CV is negative). If CVs are applied on both inputs, one CV will modulate the amplitude and polarity of the other one.
‘4-quadrant’ means that negative modulation voltages can be processed too, with the result of an inversion of the modulated signal.
Input ‘X in‘ is equipped with additional control functions:
The knobs ‘Level’ for adjusting the input amplitude (amplification max *3) and ‘Offset’ to add an offset (DC) voltage in the range from ca. -5V to +5V to the input signal (whereby a ‘dry/wet’ control for the ‘Y in‘ or a zero-point shift of the ‘X in‘ can be achieved too).
Furthermore, the switches ‘inv‘ for inversion of the ‘X in‘ input and ‘lin/exp‘ for a exponential conversion (hereby the X is working in 2-quadrant mode, meaning that only positive voltages from X in will be processed, which is adequate to rectifying behaviour). The ‘exp‘ modus suits well for loudness-correct VCA applications.
Further, the input ‘X in‘ has a red LED for indicating an eventual overdrive.
The 2nd input ‘Y in‘ is intentionally made without any additional control elements, to keep the complexity of the module as low as possible.

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