[ddouglass]

I too have had a few tell me they needed some change either more Bass or Treble or volume/reverb on the microphone or more volume on the music. Every time I have reached up to the mixer and layed my hand on whatever control they asked for and not moved a thing for them to say that was better.
ANd even better story I heard (though not related to karaoke) was from a Radio maintenance troop in the Air Force. Seems they installed a red LED with a rotary switch next to it and a battery hidden underneath on the Tower operators console. When a Tower Operator would call up saying the radio signal was too weak he would ask him if the light was on or off. Whatever state it was in he would have the operator turn the knob until it changed. Then ask him to test the radio again. Sure enough it would be fine at that point.