My POD HD500 is great! The sound is good, and everything seems to be working well, except for the expression pedal. It's really not TOO big of a problem, more of a nuisance. When the pedal (whether a whammy, or wah, or whatever) is up it's fine, but when I push the top down to get a full whammy effect, it wont stay at the +24.0 unless I push down. For instance if I lift my foot off the pedal and leave it pressed down, the octave will drop to like +23.4 or +23.5. So the only way I can get the +24.0 octave sound is if I leave my foot pressed down on the pedal. You don't really notice it with the wah, but with the whammy it sounds pretty bad. Is there anyway to fix this problem?