I JUST BOUGHT A BOUNTY HUNTER QUICK DRAW, I READ THE INSTRUCTIONS AS BEST I COULD. WENT OUT TO MY YARD AND THE THING STARTED MAKING SIGNALS ETC,, BUT EVERYTIME I DUG, THERE WAS NOTHING, SEEMED LIKE UNIT WAS PICKING UP EVERYTHING,BUT NOTHING WAS TO BE FOUND. IF IM LOOKING FOR COINS AND JEWELRY,, WHAT SETTING SHOULD I USE? I TRIED EVERYTING I COULD THINK OF, THANKS