i correctly hooked up my wah wah pedal to my amp, but there's no sound coming out at all, and i have the amp on and everything. i plugged the cable into the input on the pedal, into the amp. i plugged the cable into the output of the pedal, into the guitar. i turned the amp on and started playing/stepping on the pedal, but no amplificaiton or wah sound came out. what is the problem? (ps, the battery of the pedal cannot be dead since it is brand new)