DVD-A will ALWAYS recompress your files (audio part) if you only give it a Plain Jane MPEG-2 file that has both a video and audio steam. NOTHING wrong with that. Does no harm, quality wise you'll never hear the difference unless you're superman.

The confusion comes from DVD-A flagging the file saying its going to recompress the audio and some may freak wondering why. Its got to do with the specs. Silly world. In most of the world PAL it will accept as-is. for us in the United States and Japan, we're in the NTSC universe and that don't allow a MPEG-2 audio stream. The funny thing is other applications just go and do what DVD-A does, recompress, they just don't tell you they are.

If you want to avoid it then you'll need to render twice. There is a special DVD-A video template in Vegas 4. Actually several. Then render the audio seperately. If you give it the same file name then DVD-A won't nag and it will use it without flagging it. Like I said at the start a 'none problem' really.