The basset horn, a variety of alto clarinet, was much utilized by Mozart and was revived by Richard Strauss. The clarinet is a transposing device. See F. G. Rendall, The Clarinet 3d rev. ed. 1971. If you're having hassle with notes from the 1st B over the break and up, then the challenge could be plenty of things. If they aren't communicating at all, you could are looking to try tightening up a little bit, in order that the reed might be able to vibrate more. If your embouchure is already very tight, then that you could lighten up, also to assist the reed vibrate more. It would also help so that you can move the reed down in your mouthpiece.