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No audio passes through a DCA as it is a control circuit only (Digital Controlled Amplifier). Any input or output fader can be assigned to a DCA which will then effectively be a remote that adds or subtracts gain from the assigned faders visible position. This affects not only the channels output level to any mix,group or direct output but also to any post fader aux sends. Very useful: as an example – assign all vocal channels to a DCA. Then when you turn the DCA up or down the relative post fade aux sends (say to effects or foldback etc) will also change by the same amount.
Hope that has helped.