| Caro amico, Beppe,
What you are experiencing is what some who try the Prana for the first time experience. It is short, as you know, and has a very thin shank. This exposes any kind of weakness of the embouchure where the vibrations are not full and rich.
Here is my advice: buzz the mouthpiece when you start to practice beginning in the middle register (sol or si bemol for example) and use the vibrato. Play a comfortable dynamic and play an easy melody. If you have your stomach tight instead of flexible, your sound will get fuzzier and have the air noise you don't like. Stay loose but keep the vibrations rich. The better you get at rich vibrations on the mouthpiece, the more you'll notice the problem going away. Gradually, practice with vibrato at the softer dynamics.
You see, a longer mouthpiece stem like conventional mouthpieces will make the buzz easier but the sound will be different. Personally, I like the clarity of the Prana.
Arrivederci!
ML |