www.vcdhelp.com
www.doom9.net
check these out, dvd2dvdr.com only covers the basic stuff. These two go into a lot more detail.
You can't purchase SpruceUp any more as Apple bought Spruce Technologies a little while ago now. Don't ask for the registered version as this is now a warez item and that stuff is banned on these forums.
If you can, obtain DVDMaestro. It was done by Spruce Technologies (so once again you can't purchase it anymore), it is vastly a better program than SpruceUp.
Anyway, even with the trial u should still get sound in the completed movie.