[kowdermeister]

You can access the reduction property and connect it a gain node of anouther source.

https://developer.mozilla.org/en-US/docs/Web/API/DynamicsCom...

[Jasper_]

That's using the output of the compressor to drive another node. A sidechain compressor has two inputs.

[kowdermeister]

I know what sidechain compression is, yes, you need to code a little bit more :)