This guide is no longer necessary IMO. I’ve solved my volume control problems by dragging the Volume control plugin from the item list to the panel. Simple, but it works. I have problems with the default Volume Control plugin in Xubuntu, so this is a useful solution.

Ubuntu Multimedia Center is a complete Linux-based operating system, freely available with community and professional support.It is also a live cd that is ubuntu derived and also free. This system was inspired by the fact that ubuntu didn’t have much of a multimedia center.Because users would have to manually download the codecs for playing mp3’s and what not