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Sidechain for compressor

Member for

21 years 2 months
Dear all knowing recording gods . . .

okay - sorry about that. But now you're reading . . . and after that cat-washing post I feel a little more open to adding some spice to my posts!

I've heard little about this - and it may be more of a mastering question - but can someone fill me in on the theory of using a sidechain and subsequent EQ with a compressor? thanks!

scott sends . . .

Comments

Member for

19 years 4 months

Kurt Foster Thu, 06/12/2003 - 12:00
Scott,
There are two main ways that key and side chains are used on compressors. One involves ducking where you run say a harmonica through the compressor and key the compressor (or trigger it through the side chain ) off the lead vocal. Every time the vocal comes up, the harp is turned down by however much gain reduction you dial in. Automatic gain control.

The second way is dynamic eq, where, by example, say you have a particular frequency that is bothersome on a track or source creating a resonance or overtone. So you patch and eq through the side chain of the compressor, dial in the offending frequency on the eq that is patched through the side chain. Set the compressors gain reduction (threshold) so that it is just barely staring to kick in. Now by boosting the gain on that specific frequency on the eq, you can trigger the compressor to react specific frequencies causing it to apply a cut when ever that frequency creates an overtone.

Member for

21 years 2 months

Pro Audio Guest Thu, 06/12/2003 - 13:15
Thanks Kurt! - one more part to the question (for now!)

when my compressor (presonus acp-88) reacts to the frequency i've selected the eq through the sidechain, will the entire signal be compressed - or will only the selected frequency within that signal be compressed (as if the eq has a compressor)?

now i'm going home to wash my cat.

scott sends . . .
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