The left-hand F# can become stuffy on bass clarinet. This is particularly true when the instrument seals very well. A good seal will increase the amount of air that needs to come out of the first open tone hole. The F# tone hole is not the appropriate dimension to handle the extra air pressure. All other notes will have a great full and open sound, but the F# will sound stuffy. The F# resonance mechanism eliminates this problem.
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