I just got my new Pod HD500 for christmas and love it so far, the only issue I am having with it is that even when my expression pedals are at heel to ground position, I still hear strong aspects of the effect that I only want to be triggered when I use the expression pedal. This has happened even with my minimum level set to 0% so I am confused why, at a minimum level of 0%, the effect is still easily recognized. The pedal does its job by making it more intense when I press down, but the effect never fully goes away when I release. For what reasons could this be / is there a way to fix it?