I've had some benefit from buzzing lips alone, working on a teeny thread of air that makes a very high tone, doing the exercises Markie talks about, and just messing around playing TUNES. Markie didn't invent the exercise, the 7 in 7 thing, it's in my Gordon book and probably goes back to Clarke and maybe back to Arban, but it's a good one. That video kicks butt! And it looks like he's playing a cornet too. It shows the ideal, just using lips and air to hot all those resonances, all the way to as far as the guy can go. I'll tall ya, that 7 in 7 exercise is such a good idea, who doesn't have 7 minutes in the AM and PM to practice it?