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You have 16! DCA’s
In this way you can assign you FOH inputs to DCA15 & your Mon inputs to DCA16.
Use the User defined Keys to Mute the DCA and your reached your goal.

Even better if you assign these DCA’s to a strip you can acces your Master volumes for FOH & MON separatly (as the DCA’s control your inputs).
You can even assign your Masters to an DCA and only mute the masters!