Topmusicanswers
This usually comes from AC power leaking into your signal somewhere, or it could be your guitar pickups. Try a guitar with humbucking pickups to make sure the noise is actually coming from the pedal and not the guitar. ... The last common type of noise is a high-pitched squealing sound.
Why is my pedal so loud?
A good rule-of-thumb is that if a pedal is noisy, even if the effect is turned off, the culprit is very likely the power supply. In the worst cases your pedals will make a noise, and the signal leaving your pedalboard will be a mere shadow of itself.
