I am having issues with my flute and the a flat key. I can play some notes clearly, some notes fuzzy, and some notes just sounds like air rushing through my horn. This happened earlier this week, and I took it in to my director and she fixed it by simply pushing the a flat key around a little. I knew this, so I moved it a little bit and it did not improve. Any ideas what to do? I need to memorize a lot of music today so help would be greatly appreciated!