My daughter, who doubles on alto and tenor, has trouble playing her alto in tune. The sax (a Selmer AS-100, I believe) is flat across the board. I don't play alto, so I can't play-test her sax and see what's up. She's using a Vandoren V16 A7 mouthpiece. Aside from a tighter embouchure, is there anything she can do to sharpen pitch across the board? I know that larger chamber mouthpieces can lower pitch. Can smaller chambers raise it? Any suggestions for a mouthpiece that might sharpen things up? And yes, the mouthpiece she's got is pushed all the way in. And she's been playing for 5 years.