Re: How does Vai get his distortion?
This must be the first time that I have seen so much interest in Vai's tone....I never liked his tone much (its not bad, but it doesn't grab my ear either), his playing sure makes up for it.
The old dogs with Pauls and Strats have far better tone than the young kids with fuzz and white noise pouring out of the amp (and I grew up on thrash metal in the 80s).
Now take those great classic tones and play cool stuff = those legendary players (EVH, SRV, Yngwie, Blackmore, and lots of others). When you can shred on a Strat/Paul through a great sounding amp dry and sound good....pedals are just icing on the cake for those that like them.
Like anything else tone related, you can get gear that will get you close enough, the rest is in your hands.
I forgot to add - THOW SHALT NOT MOCK EVH! FOR ANY REASON!