The E flat alto and the E flat contrabass clarinets are mainly band contraptions. Clarinets were once made in other keys, but all of those devices are now obsolete. The basset horn, a type of alto clarinet, was much used 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 trouble with notes from the first B over the break and up, then the problem may be a variety of things. If they don't seem to be communicating at all, you would want to try tightening up a bit bit, so that the reed can be able to vibrate more.