Yes I turned up the sensitivity (I can hear the audio threshold increase ever so slightly louder as sensitivity is set higher) but any sensitivity setting more than the first block makes the faint variations completely disappear. Maybe its just my hearing. I do wish they had an extra low setting than the first block. I'm not the only person to go to this place someone else has been there prior to me and I'm guessing they got most of the easier noticeable targets - I haven't found a loud surface target yet. I have pulled out deeper pellets 12 inches and about 10.22g of tiny gold. I've also used my SDC there and found additional pieces in hard to poke in areas the 11" won't fit. I tried sensitivity 5 on SDC which proved useless and had to drop down to sensitivity 1 occasionally getting away with sensitivity 2 in some spots. It may also be the varying ground as its a mixed bag: Quartz and ironstones mixed with varying types of green, blue, orange, red, pink slates with a mixer with and red, orange and yellow clays on-top red, orange and dark purple conglomerate. The yellow clay smells like pepper for some reason.