some pedals can do this. i don’t really know why…

are you using a battery or power supply?

i only ask because mine introduces a high-pitched (but quite low level) whine but ONLY when it’s daisy chained with certain pedals. if i use it in a different chain of pedals or with a dedicated power supply or battery, it’s quiet.

Are you running it on a battery or are you using a wallwart. Try both, and also try changing the cables and moving the pedal further away from the amp etc. Maybe some simple RF rejection would be a good idea for future editions of this pedal ?

Effects with germanium transistors do this often, just depends on your location and house wiring. I have a silicon fuzz, the ultra lord, that does it so its not limited to germanium effects but more common in them. It does it sometimes so clear I can hear every word on the radio and the funny thing is that its American radio yet I’m in Australia! Just try it in a different room, different power outlet and different positions and settings, sometimes you cant get rid off it sometimes you can.

When Sonic Youth played point state park in 2003, Thurston was getting rap music through his amp

I’ve actually yearned for a pedal that could do the radio thing on a consistent basis