Hey everyone. I started to warm up for Jazz playthroughs the other day. And I'm a pretty good player in the upper register. On a good day, I can belt up above the ledger lines for quite a while So I began my usual warmup routine: long tones, slurs, etc. After a good while of warming up, I started off on ballads and gradually worked my way up. I was playing some Gordon Goodwin pieces for the upcoming Jazz tryouts. When I went to attack my higher register, I simply fizzled out. I hadn't played that long... so I tried a few more slow songs to warm up on. And I still couldn't reach my usual range. I just recently got a new mouthpiece, Bach 3C Megatone, to replace the mouthpiece that became beaten up after five or so years of use. The same size, same type. I'm wondering why my tone's fizzling... Is it the mouthpiece, or could it be something else? What's your opinion?