Take two - first upload had out of sync audio. Sorry!
I've acquired a valve trombone with Vienna valves, also known as pumpenvalves. I've taken this opportunity to talk at length about the vienna valve, how it is assembled, and how it compares various piston valves.
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Негізгі бет Музыка Vienna Valves, Perinet Valves, and the Valve Trombone
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