Haven't heard anything, but it doesn't have an air supply. So the air is somehow generated by what? A small impeller?
Turn the volumn up and hit this:
http://www.liteglow.com/sounds/MOV01819.mp3
Nice, huh? 
Here's a link:
http://www.liteglow.com/products/product_info.php?cPath...52e7b136226b2b842c29
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"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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