uhmm why did I not know about this resource earlier ?? BWF MetaEdit for managing and batch editing metadata !FREE!, cross-platform .. have I died and gone to heaven ??!!
In general, but no rule is absolute:
PREfade is mostly used for monitor mixes,
POSTfade is used for the main audience to hear.
As noted above the audience might hear the wedgies on stage if they are too loud.
Also as noted above our MD uses the post fade so the choir hears the same as FOH. That is his quirk. But it causes no real problem as the ...