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Stereo compressor in only 4HP!
The module was mainly designed as a dynamic tool for subgroups and sums, but also works well with single signals. Similar to classic DBX units, threshold, ratio and gain can be adjusted with just one knob. Further fine adjustments can be made for attack and release times. In addition to compression, the module can also be used as a limiter. Ducking effects can be created via a sidechain input.

The MSCL is equally suitable for subtle and strong compression effects. Ratio (1.25:1 to infinity), make-up gain and threshold can be adjusted with a single potentiometer. The threshold works in the opposite direction as the other parameters. In addition, there is a threshold switch that can be toggled between three value ranges (-15 dBu, -4 dBu, +5 dBu). This allows the MSCL to be used with other audio signals outside the modular system. In addition, it is possible to limit the gain control range by 3 dB or 9 dB. This makes the module behave similar to a peak limiter. The attack and release controls can be used to adjust the settling phase and the decay time of the compressor. At the output, it is possible to increase the gain by up to 35db. With the switchable sidechain channel, the MSCL can also be controlled by external signals.


  • Sidechain input for classic ducking sounds
  • Easy and intuitive design
  • Threshold switch lets you compress modular level signals as well as lower level sources
  • Limit switch limits the makeup gain on the comp knob to make compressor act more like a peak limiter


Power consumption: 50mA at +12V and 50mA at -12V

Depth: 38mm

4 HP

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Alex4 Distribution GmbH
Lessingstr. 98, 100 – Haus 11
13158 Berlin

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Tel +49(0)30 - 61 65 100 40
Fax +49(0)30 - 61 65 100 49

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