Can you assign a certain tone to a range of TID numbers. For example assign one tone for say 75-85, then a different tone of 17-22, etc. This way even if the TID is a little jumpy you will only get one sound instead of a bunch of different ones. How accurate is the TID on nickels. Seems like most detectors (even in not so bad ground) have problems with a stable TID on nickels past 3 inches or so. Thanks.