I took this from the Rane site...basically because it is a simpler explanation.

sidechain

In a signal processing circuit, such as one employing a VCA, a secondary signal path in parallel with the main signal path in which the condition or parameter of an audio signal that will cause a processor to begin working is sensed or detected. Typical applications use the side-chain information to control the gain of a VCA. The circuit may detect level or frequency or both. Devices utilizing side-chains for control generally fall into the classification of dynamic controllers.

Could you mean something like this?

http://homepages.paradise.net.nz/~rhulse/Side%20Chain/sidechain.htm

--Rick

Thanks for the great link, Rick.

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