Reply To: Foh or Mons first?

[Andreas]

…and, if that’s not already clear, I prefer to feed the monitor mixes pre-fader as well, so changing the channel’s volume on FOH does not affect volume on monitors.
Saying that, you need to understand that if you get some sort of feedback from the monitors, turning the channel volume down on FOH does (probably) not stop the feedback.
Groups are a different story, they’re always fed post-fader and do not have an individual mix per channel. They’re basically intended to be routed back to LR to simplify management of a group of channels (i.e. drums, backing vocals etc.).