ETHERL  When I first downloaded this, I used it for the same reason that most people use it for --- to drown out distracting noises. But then I had a baby. A very colicy baby. This program stops her crying & keeps her sound asleep better than anything I've ever seen! As soon as I turn it on & crank it up, my daughter stops crying. And it keeps her from waking up at night (I turn it down once she's asleep). It works faster than the kitchen fan/vent and it uses less electricity than the vacuum!  
(Version 1.1)