Tazii, set it on coins mode, metal discrimination at 35, sensitivity about 2 from flat out and watch the Target ID values. You will find a list of target id's on here somewhere that will tell you what values will result in pennies, silvers etc etc.
Good luck. The Pro's a great machine. I luv mine.
If you cant find the list...I think Nugget did it.....give me a yell.