User's Manual

8.4.4.7. Compressor
A compressor is an automatic level control. If a signal rises above a certain level (the
threshold), the compressor lowers the signal output to compensate (at low Ratios) or won’t
let it rise at all (high Ratios, also called “limiting”). It is generally used to help maintain a
consistent level of sound, though there are many other ways to use it.
For example, it can keep the attack transients of a sound from overloading the input of the
next effect. It can also help a sound which would normally decay quickly to sustain longer.
The red gain reduction meter shows you how much the compressor is reducing the gain, if
the input signal is greater than the threshold and the ratio is greater than 1:1.
Control Description
Attack
Adjusts the speed with which the compression will be applied after the threshold is reached,
from 0.01 to 1000 ms.
Release
Sets the release time of the compressor, from 1 to 2000 ms. This is the time it will take for the
compressor to stop reducing the level after input signal is lower than threshold. Appears as a
Mod Destination in the Advanced Modulations window and Mod Sequencer.
Threshold Sets the level where compression will begin, from -80 dB dto 0 dB.
Input
Gain
Increases the level coming into the compressor (pre-threshold). To get gain reduction, you may
either increase the Input Gain or lower the Threshold until you see reduction on the meter above.
Ratio
Determines the amount of compression to be applied once the threshold is reached. A setting of
4 means 4:1: if the input signal is 4 dB over, output will rise only 1 dB.
Output
Gain
Use this to compensate for changes in volume if compression settings lower the volume too
much.
Makeup When on, automatically increases or decreases output level to compensate for Threshold setting.
Dry/Wet Controls the balance between the input signal and the effected signal.

For most applications, a compressor should be in the 100% “Wet” setting, but some engineers find a
mix of the original and compressed signal useful.
Arturia - User Manual Jup-8 V4 - Advanced Panel 70