Torniojaws
They call me Juha
If it buzzes even with gain at 0, it is not working properly. The pedal is made of regular analog electronics components, so you can fix it easily, provided you find which part is broken. Or you could just take it to a tech.
Edit:
If it's a chainsaw buzz, not normal gain buzz.
Edit:
If it's a chainsaw buzz, not normal gain buzz.