Welcome to the party.
As has been asked, what sabers is everyone getting? And of course we love pictures, both before and after customizations.
As far as adding sound yourself, a lot of people have done it, it mostly depends on how good your soldering skills are. However, as a first place to start, you can find wiring diagrams for all the sound/LED cards here:
http://www.saberforum.com/index.php?topic=40651.0There is also an entire Technical sub-forum you can look to for help, as well as individual forums for Emerald, Obsidian, and Diamond. And an entire customization sub-forum for tips and suggestions if you're trying to get a specific look.
And always feel free to ask questions, we're a pretty helpful bunch. There is also the forum search function if you're looking for specific information, although it is best to search in individual sub-forums as a full forum search tends to take a few minutes.