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Homemade mouthpiece buzzer? or octave key?

http://www.ebay.com/itm/Vincent-Bach-6- ... Sw9r1WDd5j" target="_blank

$100 bucks and its yours!

Almost certainly from a pickup instalation.

Or if you have ever put an air compressor hose in your mouth and buzz with no effort. Hook up the compressor and if you can play over the loud hum then you can play for hours without ever breathing