Audio control thingy

hi,
I want to make an audio control and I’ve looked and looked on tutorials and I don’t care for many of them.

But the one on greenovia.net is pretty cool, and I was wondering how one might make something similar to it.

:ko:

edit: and how did they make it so that when you roll over the audio button, the audio control shows up and when you roll out, it fades out?