It is great to hear a jazz player reinforce what classical players have taught for years, that there is one basic embouchure throughout the natural range of the saxophone from low Bb to high F. Ernie mentions finding the airstream that makes all registers of the saxophone "sing". I like to go a step further in describing the place where the saxophone "sings" as the optimum input pitch of the mouthpiece into the saxophone---which of course is determined by the embouchure and the airstream.