Author: clarnibass
Date: 2014-10-16 08:42
When you play, does it always happen? Almost always? Most of the time? Occasionally? Just once in a while?
Is it very consistent that it happens after 30-40 minutes, assuming you play about the same amount? Or can it happen after 20 minutes sometimes? Or 5 minutes? Or not happen until after two hours? Or...?
What notes exactly does it happen? You mentioned mostly C and B. What about C#? D? Higher? What about the low register? Check each note specifically. When it happens, try not to change anything and just move up (or down, depending on the note you're already playing) and see what happens. Check a few times if possible.
When the problem start, does it continue, or can suddenly disappear? and only come back later (or not)?
Everything that was mentioned is possible. If there is no problem with any notes on the upper joint then anything causing a leak at the top is unlikely, since that usually affects the top of the clarion more than other areas.
Although not so likely with synthetic pads, that still possible, for example if the G#/D# is swelling it could affect those notes, but less in the low register. I've had this problem with a F#/C# pad on bass clarinet, where it took at least an hour to start feeling some resistance and an average of about 2-3 hours before the B would randomally and suddenly not come out.
The register tube getting full of water is also very possible. It can seem to stop the middle B and C especially, even feel like they don't come out at all suddenly.
But there are many possiblities.
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The Clarinet BBoard
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