This is a question posed to those that play via the Louis Maggio System for Brass. I have the book by Carlton MacBeth. I have been trying to implement it just as described in the book. I make the setup â€“ as in the Whistle Technique â€“ with the lower lip up and behind the upper lip. However, when I play this way I can start out on a low C just fine, but as I ascend and go to a G in the staff, the lower lip begins sliding out and moves forward and does not retain the original position as described in the book. Is this supposed to happen? I can continue playing and ascending, right now up to a G above high C, and the sound is very brilliant, but I just do not know if this is the way it is suppose to work or should the bottom lip stay put as in the original set up? Also, if it is suppose to stay put, how does one achieve this? I am pulling the corners of the mouth in to the eye teeth as described. Thanks!