Donnie, Which type of squeak? The really obnoxious chirp when you start a note with the tongue or are you actually hitting a higher partial? You also said something that I wanted to clarify-if you use a reed that has been used often on another mouthpiece it may not work on a new mouthpiece. The reason for this is that the reed slightly alters it's shape to create a seal with the facing of the mouthpiece. I would only use new reeds for now. If it is the chirping then that's a reed/ mouthpiece sealing problem. If it's the upper partials then I think you are raising the back of your tongue too much. This is something that you had to do before with a mouthpiece that had a lower baffle. Now that you're using a jazz mouthpiece with a higher baffle you don't have to raise your tongue as much for the higher notes. Kristy