I'm really hoping to find some help here on this forum, because I can't seem to figure out how to play clean lip slurs. Especially a slur going up. Sure, I can PLAY them, but I always get the "Sliding" sound. You know: "Dah-fwee" as opposed to a nice clean "Dah-ee." I'm doing a lot of work to focus on my air stream, and one of my brass instructors a few weeks ago says whistling can help. Still to no avail can I do a simple C to E lip slur without sliding. Let alone anything higher than that. I have been playing trumpet for 6 years but I'm really trying to bring my playing to the next level,a nd now more than ever it seems for some reason I need to be able to lip slur cleanly. Any advice on how to work into seeing some results?