Hello. I've been curious about how certain players can slap as quickly as some guitarist can trem-pick. How exactly are they slapping the strings? I was taught the method of slapping a string straight from above and letting my thumb bounce off. I've seen videos of players doing it differently and slapping really quickly. The two players whose videos I saw were Otiel Burbridge and Bill Dickens. What are their slapping techniques? How do they slap so quickly?