Hey Onionhead I was searching in all metal mode, I notched out foil to cut down on chatter after a while. On my BH (QD II) Low tones are usually Iron or foil, Nickels come in on the low tone too. I did not dig any low tones. Should I go back to digging all signals. I really wanted to find coins or rings. Gold comes in as a mid tone and displays pull tab. I was excited to be finding old style pull tabs and I only searched a quarter of the circular lake I was hunting. Started getting windy and cold so I moved in between some old buildings in an empty lot. Both the lake and lot were populated in the late 1800S. I found allot of the scrap copper there and even passed up two targets that I just could not pin point. My machine has two Knobs, Sensitivity and discrimination. I was turning sensitivity all the way up and left the other knob on all metal mode. Any help would be most appreciated.