The program is called Atmosphere Deluxe. There's also a Lite version you can get for free. I've been using it the last couple of days and it is awesome. You can create your very own nature sounds, and there is even an option to add specific binaurals!!! I just wanted to tell you guys about this, because it can be very difficult to find good binaural MP3s for free, especially ones engrained in nature sounds. Couple this program with a free music editor like Audacity, and you can make very long nature sounds with binaural sounds without having to go hunting the web to find them.

I personally recommend the Deluxe version; it offers a ton more background sounds and extra sounds to choose from. That said, the Lite version has a fair amount too, but with less customization for the binaurals. You can literally make any nature sound-scape you want--excellent for visualizing.

Sorry I can't post a link yet, but as I'm not yet a 7 day old member...well, you know. Anyway, google the program if you like to listen to nature sounds. I think you'll enjoy the program!

~SilverWolf~