I want to combine a couple video material items on one DVD. Some of this video has one audio track (stereo) and some has two (stereo and surround). Even though from a DVD structure, these videos will be regarded as seperate "movies" (DVDLab Pro) I'm setting up the option for the disc to play the whole way straight through. If I provide the viewer with a menu option to choose either stereo (audio 1) or surround (audio 2), what will be the result when the player gets to a section where there is no 2nd audio track? Will it play audio 1 or just be silent?....and if it flips to audio 1 will it flip back to audio 2 when it gets to the next section with two audio tracks? Guess I'm wondering if I have to create a 2nd audio track for everything to make the disc work. I'm talking AC3 on a NTSC disc.

Thanks for your help!