If you press the Mix key on an input, the all the bus master faders should move and become the bus sends from that input. (Much like how normally when you press the Mix key on the Bus, the input faders change to be the input sends to that bus).
If I have a reverb send that a vocal channel is sending to. And I press the mix button on the vocal channel…The reverb send fader becomes the send from the vocal channel to that reverb send? Is that correct?