When I bought my Jupiter, it was sold with a fake mouthpiece, a mere copy of Bach 7C. I replace it soon, using a genuine Bach 7C : much more better, normal. But since 3 or 4 weeks I've gradually lost high notes. Could not understand why... Today I put my old Jupiter mouthpiece back on the horn and all of a sudden I'm playing almost like Diz ! Some explanation ? Same experience maybe ?