Of the folks who have increased their Compadre's sensitivity by turning the appropriate pot, did that affect the discrimination range by shifting it a direction? Meaning does the "Iron" icon become "all metal on the knob", for example? or does the discrimination stay the same when adjusting sensitivity? Wondering how all that works. What does turning the discrimination pot do? shift the items you search one spot over? Can turning the discrimination pot too far one way knock out certain metals?