How mush does it cost you to add audio playback to FEZ? It costs you a piece of wire! Yes that is all you need to play wav audio files. Now, this is not meant to play music but it is ideal if your product/project will need to voice out some commands or alerts.
Maybe dial a number or playback a message … You can probably think of a million ways to use this.
Here is a little video http://www.youtube.com/watch?v=G3HnikN-nLk
This will be added to the SDK coming next week and will be demoed at maker faire as well.