Founder of the band, Patex, Berklee-grad Jorge Perez Gonzalez can slap those skins with the best of them.
As a fellow percussionist, and one who is very average on a djembe, I honestly don't see the point of the four-butt setup. The tonalities are all nearly exact. Gonzalez can be seen at the end of the video rubbing lotion on his human bongos.