Fucking great talk, Flash getting into the real nitty-gritty technical aspects of how he created his style of DJing. Ignore the shitty hosts.
The fun part starts about 13 minutes in, demo starts at about 43 minutes in.
Also, I'm on a bit of a hip-hop lecture binge, I'll post some more videos like this in the comments.
Kanye interview from 2013, mostly on J Dilla and the intersection of fashion and music.
Questlove on the challenges of drumming for D'angelo
Young Guru on the business of engineering and drawing inspiration from places outside of music (truly horrendous interviewer, sensing a pattern)