Have been using my 3d for almost a year now and have been specificly been hunting coins with some success.My main method is to dig only high tones that repeat from different angles.Even then I dig occasional nails, screw caps,etc but I understand thats to be expected. I would like to change my emphasis to relics(buttons,buckles,pins,etc).What tones of the four on the 3d should I pay most attention to? Since it is a great coin hunter should I forget relics hunting with it?