thanks adamjay, i think i finally got it. as the RNC/RNLA has the sidechain out BEFORE the sidechain in, you can put a fx (like an eq) after the sidechain out, and route the signal from eq out back into the sidechain in. so thats what “sidechain loop” was all about 
i was so excited about this that i had to make a little explanation grafic hope i got it right.
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