Hi .. trying to set up CQ18t so that I can separate aux mix from Front .. so I can set up IEM without it coming through the front .. the problem I’m having is when I set aux to pre fader I can only mute the whole front of house not individual channels so I can’t have music playing while mixing ears on stage .. I remember the Mackie desks had an option to not use LR mutes and that would seperate them .. and the mutes would change to say Aux Mute … is there a similar option that I’m missing ? Or is there another way 
Put the channels on a DCA group and turn that DCA down, any auxes set to pre fade will still be turned up.