Reducing guitar amp buzz and hum. I’m using the Hum X to fix my ground loop problem. This unit filters 60hz noise created by ground loops that makes guitar amps hum and buzz. This is not a ground lift device so you maintain the safety by keeping the ground in place. Used for 120V 60hz USA power. This will not fix guitar cable, power issues, or pickup related hum. Designed for 1 piece of gear. Do not use for the entire power strip!