"And now just a few days ago, I tried going out of my 300W Warhead amp to the Line In on my soundcard and I think I fried it."
HOLY SHIT, please tell me that you didn't hook one of the speaker outs of your amp into the soundcard? If you did, I can assure you that its fried.
I know loads of metal players live by that Boss pedal but I also know that plenty of recording engineers cringe when they see a guitar player hook one up. The pedal itself isn't that bad but the fact that it offers a more detailed eq style than most distortion pedals is where the problem lies. Most players completely scoop the mids, boost the bass, and boost all the super high highs.
Just out of curiousity, whats wrong with the warhead distortion? Ive never played one but anything that Dime helped design and uses cant be that bad?