Change audio format w/convertx2dvd

How can you change the audio format using convertx2dvd? It doesn’t “highlight”, and won’t let me access it. Can anyone help?

What do you want to change?

The tool will automatically set the audio output format to make it dvd compliant.

The sound on a movie of mine, plays fine on some TV’s, but gets “static” sounding on some others. The sound, I believe, is AC/3 (whatever that means). I’ve tried changin the settings on my TV to mono, surround, etc…
but doesn’t help. I was hoping to change the audio when I actually build it to try & avoid this, but the program (convertx2dvd) won’t allow it.