I didnt know how to word it in the title, but when i engage my small stone phaser through a clean channel on my guitar amp, the output has a distorted, almost like a light overdrive sound while it phases. It doesnt have that clean phaser sound. What could be causing this? I have checked the IC’s with a multimeter and they all have the same voltages at all the pins, the board does have a bit of rust. All the wiring has been tripled check. I was thinking it might be the 3 electrolytic caps need to be replaced? Also, when i first plug it in, the pedal has no phase effect, starts to make this whooshing sound, gets faster, and then phaser starts working but is distorted. Any help or ideas???