Mix bus compression range?

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#1
Hey guys I'm having a little bit of trouble understanding what compression on a bus channel actually compresses, and through not knowing what to google for the answer I figured I'd ask you guys. Does it compress the signal of the highest and lowest point of all signals or compress each signal separately as it comes through the bus? I figure they'd have 2 very different outcomes.

Cheers!
 

Mania

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#2
Well the sound that's coming through a buss is the sum of all the things routed to it. So all the those things have their own waveforms which are then added together to create the waveform coming out of the buss.
The compressor is compressing that waveform, so whatever the loudest sound coming to the buss is, will be the first to be compressed, and as you bring the threshold down the rest of the signal becomes more compressed.
 
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