This is a brilliant thread. We played at a gig the other night and noticed that the performer after us who is normally excellent, had too much treble on his guitar and voice, and too much echo ( he was sitting way back from the mikes.) as someone mentioned earlier. He'd done the sound check standing up close and then sat over at the other side of the stage to perform. If only he'd read this advice.

How do sound engineers take interference from listening performers or audience? Is there an etiquette which prevents you from mentioning the fact that the guy on stage sounds like he's singing down the Channel tunnel?