I'm a junior going on to being a senior in band. I play bass clarinet in my school's advanced ensemble. The problem with this is that I have to test on a Bb clarinet for admittance into the honors band for next year. Since I play bass clarinet, I only see notes that at most go up to a high C, not the notes past it. I've been working on playing these super high notes on a regular clarinet for my testing, but they sound absolutely terrible. They're basically squeaks. Is there any way to improve my tone?