I just got an almost new 535Q wah off the *bay and there's a slight problem with the switch. Turning the wah on is no problem but when I turn the pedal off, there's no sound. The switch doesn't fully click or something like that so my signal doesn't go through. I don't know what exactly is the problem. When I use my hand to turn it on and off to test it it's no problem but when I'm playing and use my foot I run into this problem. it might be that I'm not stepping hard enough but the 535Q is replacing my other Dunlop crybaby so I expected them to feel the same. anyone have experience with this? I don't know if changing the switch would help.