4ms Listen IN/OUT Eurorack Audio Interface Module

4ms Listen IN/OUT Eurorack Audio Interface Module

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Eurorack input and output module

Convert your signals. A simple In and Out interface. The 4ms Listen In/Out interface is a brilliant little module with one single mission. Convert your signals. The top half takes care of any information coming in and converts it to Eurorack level. The bottom half does the exact opposite. It converts your Eurorack signal to a line/headphone level.

Any signal from your computer, external synthesizer, microphone, and more can be converted down to be used in your Eurorack set up. This provides endless uses. The Listen I/O features accurate LED lighting that provides information, like when the signal is clipping, so you know exactly what you're sending into your Eurorack synthesizer.

Useful Signal Conversion
The Listen I/O is a very handy module from 4ms. This simple tool converts signals to and from normal Eurorack levels. Meaning you can use lots of different equipment to reach your creative goals. The top section deals with any incoming signals, desktop synths, keyboards, computers, even microphones. Either a stereo signal or two mono signals can be plugged into the Listen I/O and then are converted to be used within the structure of your modular synth. The LED on the front panel indicates clipping, so you can be sure you're getting a balanced signal, even if you can't hear it directly. The bottom half is the total opposite. Converting any Eurorack signals to line or headphone level so that you can use it with speaker equipment or other synthesizers.


  • 2 Line Inputs
  • 2 Line Outputs
  • LED Indicators for monitoring levels
  • Specifications
  • 62 mA +12V
  • 55 mA -12V
  • 0 mA 5V
  • 24 mm deep
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