Eurorack Module

X

4-Quadrant Multiplier

Modulator module for universal use. The two input voltages X in and Y in are multiplying each other. The results are ring/amplitude modulated sounds or control voltages. One input (X) is equipped with a switchable exponential converter for VCA-like applications etc.. The X input also has a manual level control to amplify or attenuate the input signal, an inversion switch and an adjustable offset voltage, which will be added to the X input. By using these two control knobs, one has a ‚dry/wet‘ style control over the Y input and the modulated signal. In addition, there is a little red LED indicating when this input gets overdriven (from Rev.4). 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 VCA (2-quadrant operation), a multiplier is working both with positive and negative control voltages, causing a ± polarity inversion of the modulated signal (= 4-quadrant operation).

Front view

• Working both with audio and CV signals

• Ring / amplitude modulation

• Voltage controlled amplification

• Exponential conversion

• Wave shaping

• Dynamic expansion

• One input with adjustable level and offset
  

• Easy to use

• Optional with banana or 3,5mm minijack
  

• Width: 6 HP

• Dimensions: 128,5 mm x 30,2 mm

• Depth: 35mm

• Supply voltage: ±12V

• Current consumption: ≈25mA

Soundfiles

Ringmodulation of Synthesizer and Rhythm machine
X in: Korg MS-20 filtered VCO and noise with different filter settings;Y in: Rhythm machine

Ringmodulation of Rhythm machine and Trumpet
X in: Rhythm machine; Y in: Preamplified trumpet; different X Offset settings

Ringmodulation of Rhythm machine and Cymbals
X in: Rhythm machine; Y in: Preamplified cymbals; different X Offset settings

Stereo panorama control with 2 X modules X in 1: triangle/squarewave, X in 2: triangle/squarewave inverted;
Y in 1+2: Rhythm machine / VCO

Envelope shaping with 2 X modules X in1+X in2: trianglewave; Y in 1: VCO; Y in 2: Noise
In exponential mode, depending on X Offset and X Level settings, different modulation waveforms can be achieved.

Noise modulation with 2 X modules and Delay1022 Xin1+Xin2 (exponential mode): pink noise, Yin1: white noise; W out1: Delay In
Y in2: +10V DC voltage W out2: Delay time CV input
Multiplier 1 (modulating white noise) is followed by the delay (delay time modulated by multiplier 2)

Or listen on

https://soundcloud.com/cg-products/sets/x

Documentation

PDF Download

Panel

Side view right

Side view left

Banana version