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There are a couple of ways that I can see you accomplishing your goal here. The first is to insert an FX unit directly on the Aux(s) you want to have FX on. That way you can dial in different settings depending on what the artist likes in their mix. Since I don’t own a console, I don’t know if you can multi-insert one FX unit. You could also set up a couple of FX units just for Auxes, and mix them much in the same manner you would mix the FX for FOH. The FX short returns can be included in each of the Aux mixes just like individual channels therefore giving you the ability to have separate FOH and Monitor FX mixes.

Hope this helps!