I have also read about programs to add an audio track such as ifoedit and dvdlab as well as dvdrebuilder.
It is more difficult to do this if you want to keep the same menu screens and such.
I don't care if it is play only or can only be watched on my pc.
I just totally dislike the new english dub and want the old one from the vhs.
I think you are right about the possibility of having to edit the lengths of the audio or even sync up to the video since the dvd i want to match the vhs audio to is a different master than the vhs.
So i compare the lengths of the audio streams and the running time of the movie dvd vs vhs and if it matches up it will probably be easier to do this. if there are any cuts or edits in either audio or video this would be damn near impossible to do without also having to edit the dvd footage as well.
Of course my only other option would be to have to capture the analog video off of the vhs to dvd.
There are lots of these projects i would like to do for my own enjoyment. It just feels damn near impossible since i am not technology savvy with these types of software programs and it feels like i am reading an alien language or something when i read how to's off the doom9 forums unless there are diagrams to follow.
It is almost like having to go to school or something to learn these things.