japetus
Moderator
Send him a Sweetwater link for an Ebtech Hum EliminatorGround loop noise? I'm not sure he has a complaint there.
Tell him to call his electrician. Ask him what year his house was built and when the wiring was brought up to code. Ask him how many florescent bulbs he's still got in his house or how many rheostats have been installed on his lights. Doesn't sound like you are dealing with the sharpest tool in the shed.