
12
BASICS - Sidechain Filter
Sidechain Filter
The Sidechain lter allows frequency-dependent shaping of the compression by giving specic
frequency areas a stronger or weaker inuence on the detection circuit.
The linked MS mode is most suitable to demonstrate the eect: Since most signal energy can be
found in the middle as a general rule (bass drum etc.), the lter will have its greatest impact here.
A track with a balanced proportion of bass, middle and treble frequencies should be chosen to
give this function a try.
If the SC Gain controller is set to HP (High Pass), the lter will act like a 6dB high pass and the
reaction of the compressor on bass frequencies decreases. The setting LP (Low Pass) turns the
lter into a 6dB low pass and the compressor reacts primarily on low frequencies. Again, the Gain
reduction meter is a reliable aid to evaluate the distinct modes of operation.
The combination of Sidechain lters, MS matrix and dierent Attack settings enables you to make
very selective changes and – depending on the source material – even to process single instru-
ments or voices in nished mixes. Details on that can be found in the “Scenarios” chapter.
Note: When working in linked Stereo mode, the Sidechain lters of both channels should be set
to identical values. In linked MS mode, however, only the Sidechain lter of the middle channel is
active, and in unlinked MS mode the SC lter of the side channel is available, too.
Soft Clip
Gain Reduction
MS Mode Active Channel Link
Thresh Attack Release Ratio
Left
Input
Compressor
Sidechain
Filter
Gain
Stage
Left
Output
MS Encoder
MS Decoder
Right
Input
Compressor
Sidechain
Gain
Stage
Right
Output
S
M L
R
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