The other effect that Les uses in that video is pitch change. There are pitch pedals and even harmonize pedals, but they don’t sound as good as when a studio does it. It makes him sound even faster than the rapid fire that he did. I don’t know if I will ever get close to that shredding speed. He played for hours and Les also worked on guitars making mods, the Les Paul was his colobaration with Gibson, you should see the crazy things he did to his guitars. Mary was a genius in her own right and didn’t get enough credit, she was amazing.