
16
BASICS – Sidechain Filter
Sidechain Filter
The sidechain lter allows frequency-dependent shaping of the compression process by giving
specic frequency areas a stronger or weaker inuence on the detection circuit.
The linked M/S mode is most suitable to demonstrate the eect: Since the largest amount of 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 6 dB high pass and the
reaction of the compressor on bass frequencies decreases. The setting LP (Low Pass) turns the
lter into a 6 dB 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, M/S 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 M/S mode, however, only the sidechain lter of the middle channel is
active, and in unlinked M/S mode the SC lter of the side channel is available, too.
Soft Clip
Gain Reduction
M/S Mode Active Channel Link
Thresh Attack Release Ratio
Left
Input
Compressor
Sidechain
Filter
Gain
Stage
Left
Output
M/S Encoder
M/S Decoder
Right
Input
Compressor
Sidechain
Gain
Stage
Right
Output
S
M L
R
BASICS
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