Hi, I have set the Wah-pedal in my patches to be turned off when the pedal stays on position lower than 5% for more than 500ms. But my pedal does not reach that position. Every time i lift it up totally it has positions between 6 and 12%. Reaches 0 only when I keep my foot on it pressing it down with lot of pressure. When I then release my foot, it goes again to at least 6%. The pedal itself is stiff, not loose   Is there no way to calibrate the pedal? or what could be the issue?