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Am I just strange?
Sorry to disappoint you, but you sound perfectly normal to me.
Do you have an electronic tuner? They cost about 10 pounds.
You should try playing long tones across all octaves, keeping a careful eye not only on the tuner, but how your embouchure changes the pitch.
You can't use the same embouchure for all registers. As you go higher, you'll have to take a bit more of the MP in your mouth and probably slide your bottom lip forward a little.
However, you should also experiment with the barrel joint (pulled out 2mm...etc) and the mid joint.
As you probably know, you always play a clarinet with the barrel pulled out slightly at the start. As it warms, you can push the barrel in a bit. Experiment with the midjoint...and even the bell.
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but I would always recommend vandoren mouthpieces over Yamaha Custom as an upgrade.
Yes, totally. I love the B45, but I wouldn't recommend it for a beginner. I've heard a lot of good reviews about the B45 'dot', a new model that's supposed to be even better. Perhaps I'll get one for Christmas? Then again pigs might fly!
Steve