Is it a big room? If the room is small, I'd bet that your sbd recording isn't going to sound good, because small rooms are sensitive to stage volume... IOW, if someone's guitar is cranked on stage, then the board only has to turn it up a little compared to the rest of the instruments. Result? You get a tape with basically no guitar.
Also, sbd recordings in small rooms, in my experience, tend to be extremely vocal heavy, as vocs have basically no stage volume relative to other instruments.
Remember, soundguys are mixing for the room, not for a tape. If its a large room, please disregard this message.
Let us know how it goes!