Not in the AUX slot.
AUX gets added to other stuff (including the original track output).

Track output goes to main out (soundcard), controlled by track slider
AUX Send goes to AUX slot, and gets mixed back into the main out (soundcard).
They are two separate streams that meet later in the signal flow.

So your AUX PeakLimiter is indeed limiting, but then further down the line it is being added to the track output.

Unless you have the Track fader at 0 (so it doesn't feed the Main Out) and using only the AuxSend dial for volume on those tracks, you are doing the above.
Try PeakLimit in Main out, or as a per track insert instead. AUX is for additive effects (those you want to add to the existing tracks along with the original track sound.
Main Out slot is labeled A1 at bottom right of mixer usually.


I should draw up a very simple routing diagram one of these days.


I do not work here, but the benefits are still awesome
Make your sound your own!