2
will begin after a signal has crossed over the
threshold. Release controls how long it takes for the
Compressor’s gain to return to its initial level after the
signal drops below the threshold.
Sidechain
The sidechain is the Compressor’s level detection
circuitry. Based on the signal sent to it, it will
determine how much gain reduction is applied.
Typically that signal is a copy of the input signal,
taken from some point in the audio path. In our case
it’s taken after the gain reduction has occurred, which
is known as ‘feedback’ style compression. It can be
very useful to alter the sidechain signal in order to
Sidechain
Level Detection &
Control Circuit
Gain Reduction
Device
Sidechain Insert
Control Signal
Pedal Input Pedal Output
tailor how the compressor reacts.
Sidechain High Pass Filter
The SC HP (high pass filter) knob can be used to
avoid triggering the compression with high energy
low frequency notes, which helps avoid over-
compressing and keeps the low frequencies sounding
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