>I just recently tour managed a friend and would set up her mic sound every night, and each time I would need to play some sort of subtle trick with her so that she felt things were just right. No amount of 'rational tweaking' could achieve the same.
Could she have been responding to the acoustics in the new room?
During soundcheck there is no crowd around, so the acoustics sound super boomy which is not good for the vocalist. So one trick is to almost have a soundcheck sound that accounts for that, and then switch it up later once the venue packs out.
Could she have been responding to the acoustics in the new room?