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There is nothing wrong with breaking down a system, tuning the individual parts and then testing the results together. This is exactly what buzzing is - isolation of the sound generator. The mouthpiece clearly defines the edges of the vibrational surface. The face muscles have to support the buzz as the instrument impedance which causes the slots is not there to do this for us. On more conventional mouthpieces, you can use this method of practicing as there is much less "dependancy" on the rest of the system.

I am not sure that the difficulty has anything to do with heavy. I play an Ajna2 and the heavy standard B2 works fine, the B2 Prana and my STC1 B2D Prana (much lighter weight) don't buzz as well.

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Whenever I feel blue, I start breathing again.