TMPGEnc audio problems

OK, I have read the tutorials and have just a few questions.
When I use TMPGEnc to combine the mpgs into one for continuous play, there is no audio. What is the best software (free preferrably) to use to convert the audio to what I need? And then, do you combine the mpgs first and then convert the audio? I didnt see that addressed in the tutorials. If it was I apologize.

New to this stuff…getting better…just need some guidance

Thanks

Chris

OK. I downloaded VirtualDub and a tutorial. So I think I might be able to do this. My only other question is: Will this program work if I have already converted the AVI to MPG? Or will I have to re-convert the files back to AVI? Is this possible…

Thanks again…you guys are awesome!

-C

When you convert with TMPGEnc it leaves you with two separate files, video and audio. Did you try playing the file(s) before converting to dvd format?