Yeah, I have the same problem…when the pedal is engaged I start hearing that train track noise. The noise is louder with sub set to off…when sub is turned on the noise is mostly inaudible, but I like it better in the off position. Also, the only time I’m hearing the noise is when I’m not playing…when I’m playing everything seems to drown it out. Also, I’ve tried new strings, using a 10′ cord from the amp…I’m not using a wall wort, could this be the reason?