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I've heard of reverse gain as an indicator of gain through a device
connected "backwards", i.e. a signal is applied at the output pin of
an op amp, and measured at the input pin, gain being measured-at-input
divided by applied-at-output.

But in the context of pro audio, specifically, microphones connected
to mixers in a pro audio (live or recording) situation, what does
"reverse gain structure" mean?