How big is the choir you're working with? The choirs I record are generally quite large anywhere from 60 to 150 people. I have done some smaller groups within those choirs. When I've recorded them they may be acapella, or with a piano or even a small string and even horn section. I only set up for the choir and hope the other musicians play the room. Sometimes there has been percussion and that can get a bit loud but at that point it is what it is. But I've never used headphones for the choirs it would be virtually impossible unless they were smaller groups in a studio type setting. And I've never had a choir sing to a track only with what I've mentioned above.

On the master bus I had a cut at 20-25 hz which would be inaudible. I did do some expansive bass cut on an eq on the reverb channel which is a taste thing and doesn't impact the audio signal, only the reverb. Thank you for watching!