"Gerlach Mix"
Note: This is probably the audio that you are hearing. :)
I should probably tell you more about this. While in digital design, I created this on Soundtrack. It is a really cool program from Apple (only for Apple...that is the bummer). They give you a library of non-copyright sounds and you create you own mix/song/audio file. It was cool, but you have to go in with an idea of what you want to do.