4ms Company Listen IO User Manual

The Listen IO is a simple module which gets signals in and out of a Eurorack system by converting to and from
normal modular levels. The top section converts any external signal to modular levels by providing up to 30x gain
(+30dB), allowing you to use table-top synthesizers, keyboards, phones/tablets, computers, toys, microphones,
etc. in your patches. The bottom section does the opposite: modular signals are converted to normal line level
signals. The bottom two jacks can be used as line outs or as headphone jacks, so you and a friend can listen in
stereo at the same time.
Each section has two inputs and outputs for use with a stereo signal or two mono signals. An LED bar graph for
each output shows the signal level and clipping.
Listen IO
The features:
• Line to modular conversion, and modular to line/headphone conversion
• Works with guitars, table-top synths, effect pedals, keyboards, groove boxes, and many microphones
• Dual mono or stereo conversion
• LEDs show signal level and clipping
• Gain knob allows for wide range of boost or cut
• Headers in back for connecting to
• Two headphone outputs and stereo inputs for use as a compact headphones module
Listen IO
4ms Company
User Manual 1.0 – Jan 2, 2019
LISTEN IO
Listen Up
or DIY adaptor module (1/4", banana, etc.)