I have recenly discoved the pre-loaded programs on my DFX-300... I usally searching for coins in low to medium trashy areas... I was useing the DP-Silver program yesterday and it was acting weird.. It would go off like it saw something then i would go back overe the spot and the metal dectector would not pick it up agian, these happen like 10 to 15 times... and i was going to ask ya'lls option on taking the pre-amp to from 2 to 3 on this program?.. can anyone help me out are give me some advise on useing this program? I live in Mississippi ='s no minlized ground... thanks guys!!