They often use the wah pedal as a filter or slow sweep.They don't use minor scales as often as people think...slow down there solo's and you might hear a major 'happy' scale or pentatonic.

A good one(and one of my favorites)is 'Blood Red'...It can be confusing at first reading tab since they shred so many notes,so definitley play along with the music.

Good luck and have fun!