thanks, some fun links by those science guys!

yeah the limit to 5 pitches (2nd-6th partial) 
seems to be the max speed a human can spin the 
thing, and the fundamental is always inaudible.

about the name, what the industry and the users 
call them could be different.  is there actually 
a name on yours?  the sticker on mine says "magic 
sound tube" (german import)


>Hmm. Never actually thought to work out the 
>pitches. They have 5 different tones depending 
>on how fast they are twirled. And they can be 
>blown as well.
>
>Check out https://www.youtube.com/watch?v=CuGnsW0ysrA for a demo.
>
>And names? Like many percussion instruments they 
>have more than one name - sound hose, twirly, 
>musical sound tubeŠ..

-- 

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