i use the 1 tone and 3 tone on the t2, Ive noticed a lot of people like the 2 tone , i cant get used to the zip sound i would if it worked well?Layed a dime a quarter and a screw cap off a bottle on the ground and the bottle cap and quarter zipped at a lower pitch than the dime do i have that backwards?what do you listen for in 2 tone, what to dig and not to dig any advice would be appreciated thanks!