Hi i have made my videos rendered them with vegas 9 sound works fine i then bring my project into HD studio 10 when i play the preview there is sound but when its re-rendered for me to make a dvd the sound is gone.
Any help would be very welcome thanks.
Here's the long answer on how to render your audio:
From your main menu, choose Render As. For the Save As type, choose Dolby Digital AC-3. There are other audio types, but choose this one to get started and then you can decide later if you want to use a different audio type.
Name the audio file the same as your video file. For example if your video file is dog.mpg, then your audio file should be named dog.ac3. Be sure to store your video and audio files in the same folder.
By naming the audio and video the same and keeping them in the same folder, DVD-A will "magically" be able to find your video when you add the audio. Pretty cool, eh?