Okay, so I broke my Holy Stain pedal and I'm pretty sure I know how I did it: I plugged an adapter in it which had too much voltage. From that point on, I have this ridiculous humming that outputs from the pedal. I've eliminated every other possible factor, but I know for a fact that it's this pedal that is broken. I figure I fried something internally or something like that.

Does anyone know if it's fixable? Is it just a case of replace the potentially fried part? Has anyone ever had this happen to them? Thanks a lot.
Vantage Ghost Gibson "The Paul" copy
Fender FM-100H half-stack
Regal vintage 30W class A amp head (handcrafted in Montreal)
You likely damaged the voltage regulator IC. If you're really, really lucky, that's all that damaged. If you're unlucky, then the other ICs after it were also damaged by the high voltage. Contact the manufacturer and see what they say. They should have something on their website regarding out-of-warranty repair.