Yes I have played with the tone switch. But what I have been reading about sound or loss of hearing, there is a difference between "tone" and "frequency" That is what I am trying to figure out if I am missing anything. I know I can't hear a high frequency sound, as most people loose that hearing as they get older, but I am sure mine is worst than most. Maybe I am just trying to find an excuse why I haven't found that mega nugget yet.