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I've been working on a project my director gave me, he gave me a bunch of pads and a clarinet that needed repaired. I have all the pads in, I oiled it (it was wooden), and I replaced a few corks. Everything works fine (after using a different mouthpiece, as the mouthpiece was wooden and fifty years old, and wouldn't play anything), except the keys for C#, C, B, and Eb in the upper register. They work fine in the low register, but once I pop up to the next register, those notes, and those notes only, don't work. What could be the problem? Note: I did have to take all of the keys off and put them back on, if it could stem from that.
 

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You've got leaks. Clarinets are more sensitive to leaks in the upper register than the lower. It's likely the low notes don't sound that great, either, but at least they'll speak.
 

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It's easy enough to do a quick test for leaks. Take each joint in turn, position your fingers so that all the pads are closed (don't press hard, use a light touch), put the joint up to your lips and seal off the other end with the palm of your left hand - then gently blow down the joint. If you have a good seal you'll feel the air pressure 'bounce' right back at you - if you have a leak you won't be able to maintain a constant pressure.
That's your starting point - if you can't find any leaks but can feel air escaping, you'll have to use a feeler on each pad.

http://www.shwoodwind.co.uk/HandyHints/LeakyPads.htm

Regards,
 
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