Can someone explain what I should be listening and/or looking for in the deep silver mode? I briefly tried it at an older school today and Im not sure of what the detector was telling me.It seems to be an all metal program,but for the most part it seemed I was hearing the loud high pitched tones on iron targets and thats what the screen was also displaying.Every so often I heard what seemed to be a (for lack of a better term) muffled high pitched tone which was much quieter than the tones going off most of the time.But these "muffled" tones were very difficult to get them to repeat,most times I couldnt get them to repeat.Is this what I should be listening for?