not knowing how your engineer mixes limits us, but you can sub-group certain channels togethor in a seperate mix(usually matrix out or aux sends).
of course, if you want everything the board is sending to the PA, you can use main out or tape out.
I agree with the rest in pulling a aud source.the only time I pull a sbd out is if Im mixing with mics...straight sbd is very harsh and strerile sounding