On this guide there is the following suggestion: http://www.doom9.org/index.html?/dv/guide.html "save the DV file as either type-1 or as a type-2 AVI. Save the audio separately to a WAV file (your DV editing program should offer this option" But the final AVI is only 1 file and no wave audio file is seem... it says my editing dv program should allow me to do this but it doesn't "STUDIO 9" so the question is how... I know I have to convert the WAV to AC3 for DVD NTSC so I need to do something about this...
The Doom9 guides are good but in most cases they are written for real tech freaks. AFAIK it is not absolutely necessary to create AC3 for a DVD (PAL or NTSC). I would just work in AVI (containing both video and audio) and feed that into an encoder or a decent DVD authoring program to create your DVD.