regardless of whether the aux is pre/post fader, it is still only sending a portion of the signal to the compressor.....if you can still hear your signal whilst sending it via aux and not plugging into anything, then you are NOT sending the whole signal through....trust me here dude.
AUX sends for reverbs/delays etc
Insert points for dynamics processors (ie comp/limiters/ EQ)
Pre fader means that the send wont be affected by movements of your fader, which is usefull for monitor sends
Post Fader means that the send WILL be affected by movements of your fader, which is usefull for FX sends.
Seriously, trust me here. This is not me just taking wild guesses....Your compressor is ONLY receiving a PORTION of the signal, and thus is NOT compressing the whole signal, which means it is not doing its job.
Where are the outputs of your compressor coming back to??? The Aux returns??? try turning the aux return master down all the way, so it is OFF. Do you still hear the original signal on channel 1????
Even if the send is turned all the way, it is STILL only a portion of the signal being sent.
Good luck...
