I was asking in another thread how to rip a 5.1 audio DVD into 6 audio files, but haven't gotten an answer.
Audio DVD or DVD-Audio?
those are two different formats. ADVD is just regular DVD with single usefull directory Video_TS,
but instead of video, contains audio only streams such like stereo, DTS and DD.
DVDA (usually hybrid) contains 2 directories, Audio_TS and Video_TS. last one contains same stuff,
as ADVD, but additionaly do have HiRez surround and stereo streams in Audio_TS folder.
my guess that you're interested in DVD-Audio. if so, then to rip HiRez tracks from Audio_TS, you need
foobar2000 with foo_input_dvda component or DVDA Explorer. both are freeware.