You're welcome. Glad I could help, though that was some ****-ton of crappy software and so-called online converters I had to wade through to get to one that worked!
For anyone else interested, the sequence is
DVD Decrypter
DVD Decrypter to rip the video tracks to hard disk (will overrule any hard-coded copy protection that other progs may get stopped by)
then load the VTS files (VTS_01.VOB, VTS_02 etc) into 4K Video to MP3
https://www.4kdownload.com/products/product-videotomp3
and burn resultant files to disc. And you're done.
Both progs are freeware, and spyware free too.