I don't have a copy of GB 3.0.4 (I'm running 5.1)...
Do you not have an option under the share menu to "Burn to disc/CD"?
Do you want to export each track lane in GB to a separate audio file and place it on a CD as data files?.. or are you looking to make an Audio CD (playable on a CD set top box/Hi-Fi system?)
If it's the former, then solo a track, Share the project to an audio file unsolo that track and then repeat the process for the remaining tracks.
Then create a Burn folder in the Finder and add the files to the burn folder and burn to a DVD or CD.
Let me know if this helps or not.