Can you imagine how the poor FOH guy feels when the guitar player, keys or bassist comes up and says there's too much "mud" in my sound, or the punter asks him to turn down the acoustic drums (that are already muted in the house!)!Trying to get some idea if there is too much highs, lows, compression etc can be like pulling teeth lol. Putting something subjective as sound, especially when folks have impaired auditory systems, into words is not an easy thing.