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I’m not sure I follow you on the “split Aviom”, but once you patch Aviom out of the MMO card, their volume is pretty much up to them. I’m assuming you have their A16II mixers patched straight to wedges. You are pretty much out of luck in this case. Have to rely on them to control level.
There are some crazy signal flow things you can do to be able to control their overall level, but I’m not sure how in depth you really want to get with this.
You can always run the output of the Aviom mixer through a channel on the console and then out to the wedge. That way you can tweak the monitor channel to your liking, including muting it, in case of horrendous feedback. If you need to get fancier, you can feed that output through an Aux or Matrix so you can get Graphic EQ and tec.
Hope it helps.

Gil Parente
Design & Integration
Entertainment Arts, Inc.