I have been playing with the different settings,trying conductive vs ferrous signals, reading Andy's book and last night I went through a lot of your old posts and finally started hearing the difference between good and bad signals in ferrous. I dug a lot ( I mean a LOT) less pulltabs and got this nice little pendant which showed as foil ( I am crossaving so I have icons but ferrous sounds) about 4" down in a park. It's 18K and has 1 diamond that tested good.