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The Trombone ForumTeaching & LearningPractice Room(Moderator: blast) Flexibility Advice: a change in mouthpiece?
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timothy42b
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Location: Colonial Heights, Virginia, US
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« Reply #40 on: Jun 09, 2017, 05:20AM »

This makes me wonder... Should a basic part of the QA process for modern trombone building include the use of a borescope to inspect the horn from the inside?

--Andy in OKC

No.  Discontinuities are unavoidable.  Every bend, every change of diameter, every spit valve, etc. 

You could do a swept frequency measurement of the impedance curves, and compare that to your standard curve from a good trombone. 
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Tim Richardson
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