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(dal)
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I stumbled onto a Dave Bargeron website and discovered he`s using a device of his own invention called "Bravo" (stands for "Bargeron Rapid Articulation Valve Option" or something like that). 
 
It`s essentially a piston valve that replaces tonguing notes by rapidly cutting off the airstream.  I`d be skeptical, except the guy`s an amazing player he and says this opened up his playing immensely. 
 
Does anyone know anything about this?  Where (if anywhere)can you buy it?  Is it any good?  Etc.? 
 
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