A funny story I recall from the days when we used to do the Royal National Eisteddfod of Wales... I was on the sound desk in the Main Pavilion for a brass band concert (!)... the director and another bigwig came into the sound control room during the performance complaining very vociferously about my poor sound balancing skills...

Apparently it was far too loud in the auditorium, and I had to do something about it at once!

Well...! I politely pointed at the sound desk, and showed them that all the faders were down! I explained that, as it was a brass band and didn't need any help, I was merely using a microphone for announcements, and no microphones were open during the performance.

If he wanted the band turning down, he must speak to the conductor, as there was nothing I could do!