I did not write this but got this from someone else.
"....It will be fine except in heavy trash areas. For heavy trash areas you may want to just hunt in tab mode or try this: Find a point on your discriminator where tabs break up-make sure this is noticeable and not just a click sound. Also, make sure it's not one of the square tabs that register as nickels. Mark this spot-it's the only mark you'll ever need-even if you don't like using it-it's always a reference point. Now, after you hit a target in foil,or just under nickel, move the knob to this mark. If the signal goes silent, it's in the nickel range; if it breaks up, it's in the tab range; and if it still sounds good, it's in the coin range. This is a modified version of "thumbing", but you only have to make one movement, and the point where tabs break is not too far from the nickel setting, so you won't be moving the knob all over the place. But for most hunting stay either in foil or just under nickel...."
"....It will be fine except in heavy trash areas. For heavy trash areas you may want to just hunt in tab mode or try this: Find a point on your discriminator where tabs break up-make sure this is noticeable and not just a click sound. Also, make sure it's not one of the square tabs that register as nickels. Mark this spot-it's the only mark you'll ever need-even if you don't like using it-it's always a reference point. Now, after you hit a target in foil,or just under nickel, move the knob to this mark. If the signal goes silent, it's in the nickel range; if it breaks up, it's in the tab range; and if it still sounds good, it's in the coin range. This is a modified version of "thumbing", but you only have to make one movement, and the point where tabs break is not too far from the nickel setting, so you won't be moving the knob all over the place. But for most hunting stay either in foil or just under nickel...."