I am able to play the altissimo range in tune and clear on Alto and Tenor. I want to know how people crack or split the notes. I hear it all over the place listen to solo's. Here is a good example of what i am talking about, http://www.youtube.com/watch?v=fnLeGoqUAVU If you skip to about 3:00 Cannonball cracks those high F#'s repeatedly. I hear him do it all the time when listen to his solos. Is he just growling or using different fingerings? Maybe both? If anyone can give me some tips or advice it would be greatly appreciated.