i was listening to some slipknot live shows and i noticed that during the song Sic, during the bridge Jim does this weird wah sound 4 times, i researched and i heard a live interview of him say it was his maxon af-9 and then he said in a interview for guitar world that it was a mxr auto q, i bought both of them and i have watched how jim does it but still no good, i cannot figure out how to get that weird filter sound thats heard on the disasterpiece dvd as well as the 9.0 live cd. has anyone found out how jim does that sound on those pedals?