I got a Zakk Wylde Signature Wah! The sound was incredible... until I backed my foot off of it... I guess it was built so that when you push back on it, it filters the sound to a certain extent. This is a useful feature, so I am not considering getting a new wah, but it almost totally mutes my harmonics... Would a distortion pedal or and overdrive solve the problem? I'm running it through a Line 6 Spider III 15v amp.