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I use DCAs for this type of control. Muting the DCA will mute its associated inputs, the DCA fader controls the overall signal of the inputs. I don’t use groups.

Think of the matrix(es) as a way to send “mix” signals (auxes, groups, L-R-Mono, etc.) to additional output ports. The matrix allows you to distribute your mix or parts of your mix to additional areas, for recording, nearfills, listening rooms, etc.

-Tim Tyler