I've been drumming for about 6 years. I've always played rock and funk, but now I'm trying to learn jazz. I got a copy of The Art of Bop Drumming by John Riley and I'm working on the early exercises on page 9. I find that I can do the ride, snare, and bass drum patterns (and all combinations thereof) perfectly, but as soon as I try to add those simple hi-hat chicks into the mix, I go full retarded and completely lose the patterns. It's like I've hit a brick wall, and my left foot is obviously the problem. So, what do you guys think is the absolute best way to improve dexterity and timing on the hi-hat foot? I considered doing Stick Control exercises with my feet, but I don't know how much that would help me to improve my timing within the context of a beat.