INS header
The INS header of the top section can be used to connect to an adaptor module such as the
Listen Up. This allows you to use a different size jack, such as 1/4” (6.35mm). The INS
header has pins for the left channel (bottom pin), right channel (top pin), and ground (center
pin). The input impedance is 100k. Whatever signal is present on the header will be added to
the signal on the Line In jacks: both can be used simultaneously.
Modular to Line Section
The bottom half of the Listen IO converts Eurorack signals to line or headphone level. The
outputs are compatible, instrument-level equipment. There are two independent channels
which share a common Level knob.
Mod In jacks
The two Mod In jacks are the inputs to the bottom half of the module. Typically, you’ll patch a
modular signal into these jacks. These jacks are mono; if you have a stereo signal, patch the
left channel into the left jack and the right channel into the right jack.
Level knob
The Level knob controls how much the Mod In signal is attenuated (The process of taking a
louder signal and converting it to a lower level signal is called attenuation). Although the
signal paths of the left and right channels are separate, this knob controls both channels. The
amount of attenuation can range from negative infinity (muted) to 0dB, which means the
signal level is not changed.
LED bar graph
The LED bar graph displays the level of the attenuated signal. The more lights that are on
and the brighter they are, the louder the signal. Unlike the top half of the module, the bottom
half will never cause clipping, and therefore there are no red lights.
Line/Headphones Out jacks
The two Line Out jacks output the attenuated signal. These are multi-purpose jacks and can
be used as mono line level outputs or stereo headphone outputs.
If you’re using these jacks with mono cables, then use the left jack as the output for the
attenuated signal of the left Mod In jack, and the right jack as the output for the attenuated
signal of the right Mod In jack.
If you’re using these jacks with headphones, then both jacks will output both signals. The left
jack will output the left signal in the left ear and the right signal in the right ear. The right jack
swaps the left and right signals and outputs the left signal in the right ear and the right signal
in the left ear.
OUTS header
The OUTS header of the bottom section outputs the same signal as the Line Out jacks,
without the ability to drive headphones. This header can be used to connect to an adaptor
module such as the Listen Up for outputting with different size jack, such as 1/4” (6.35mm).
The OUTS header has pins for the left channel (bottom pin), right channel (top pin), and
ground (center pin). The output impedance is 1k, and the header can be used
simultaneously with the Line Out jacks.
