Has anybody seen, heard about or used this? It's a long tube which is supposed to send vibrations into your airways when you breathe into it, and in doing so pry loose the mucus from your lungs and help you get rid of it. From what I can see (http://abclocal.go.com/kabc/story?section=news/health/your_health&id=8942927 ; http://www.lungflute.com/copd-reference-center.php#usage) it can't hurt, and it's supposed to be relatively cheap, about 50 dollars, but I don't want to buy it if it's snake oil. Any advice, opinion will be appreciated. I am now stage 4 (FEV1 down to 27) and definitely need all the help I can get....