If I send a track/channel to a Aux and then back to a new track/channel its no different sound wise than just duplicating the track Protools.
I guess i'm confused at what your going on about.
Ok, English isn't my native language so I will try to explain it to you differently.
I agree with you on the fact that duplicate a track or send it to an aux is the same thing.
But we speak about mixing so when doing mult you have:
-your original track with processing on: eq, comp...etc
-your mult feed from your original track previously processed and you add other eq/comp to that
Now the way you describe it:
-original track with processing
-duplicate track when you add same processing chain as original and other eq/comp on top of that. So you use 2 identical plugin/hardware chain on each track (original and duplicate) and other eq/comp you want to add for your mult.
Maybe it can sound over complicated described that way, I don't know...
Point was Mark/Jason and also Colin doesn't apply different eq to the same raw track in //. They put eq on original track and after that, they put other eq on already eq ed original track in //.
That not the same raw track eq ed differently in //.
It's raw track eq ed and re eq ed in //.
That the same thing you do when sending lets say you kick and snare to a buss in //. You don't send your raw kick and snare to that but your already processed element.
Hope that make sense...