Ahhhh!!!...
in ALL-METALS mode, you get only one tone...this tone will get louder and stronger as you near the center of your target....You would hunt in non trash areas with this mode, such as open farm fields, gold fields, etc....you may swing the coil in this mode, and when you hear a tone, you can check it by slowing your and tightening your swing over the object until you find it's center (loudest sound)...I am trying to remember, but I think you will NOT read depth in this mode...In all other modes, you will get the 3 tones...LOW for iron/foil, and nickels, medium for pull tabs, screw caps, and zinc, and GOLD...High for copper, dimes, quarters, halves, dollars, and large iron and SILVER...Your display is quite accurate, but different items can show as the same object, such as pull tabs and small gold rings, or zinc and large gold rings...lead and aluminum also show in the pull tab to zinc range...brass I believe shows as copper or quarter depending on it's size...All of this comes as second nature as you use your machine and get to speak her language...She is a sweat talker and you 2 will soon fall madly in love and make your better half most jealous, or happy, depending on your finds...lol
Once again, read your manual and do as it says inside or in your own yard until the controls become second nature...Especially learn how to correctly set up your ALL-Metals mode...Hit the ALL-Metals with the coil at waist height, then hit the Ground-Trac...lower the coil to the ground, and if it makes noise, hit the ALL-metals button again...if it is quiet, hit the Ground-Trac to lock this setting in...If it still makes noise, hit the Ground-Trac again till it is silent...Your all set...
Ground-Trac works only in ALL-Metal mode...In all other modes, the ground balance is factory pre-set...
(hence why mine never worked right in our mineralized soil here in CNY)
HH,
GoGoGopher