Ok, i figure this is the right place for this.

I own an old DOD grunge (yeah, i know. whatever) and it's actually a pretty fun pedal. nice n noisy/raw/crazy.

anyway recently i've been having problems from it and i don't know why.

Sometimes it works perfectly fine, but other times if i turn the volume knob to/past high-noon it starts this annoying whine/feedback. which is fun to mess around with for a little while tbh. when it gets all whiney i can use the other knobs to change the pitch of the tone.

anyone have any idea why it would do that?
It's feedback, don't stand so close to the amp, or don't turn the volume up so loud.
I don't give a shit if you listen to me or not