How to change audio attributes
Open up the ifo for the titleset (vts), open VTSI_MAT, scroll down to
"Number of audio streams in VTSTT_VOBS, then find the track you want to change.
Double click on the track (where it says, eg, "Aud_1: audio attributes:"), a dialog box will open up
with among other things, a dropdown list of extensions. Make your change, but you will need the
value for later, so click on any other table, then back to VTSI_MAT and find the entry again.
Make note of the sixth byte (third from the end). SAVE the file.
Now the tricky part, the part most people miss, you must do this again in the copy kept in
VIDEO_TS.IFO, and here you have to find the correct copy. Open up the file, open VMG_VTS_ATRT,
scroll down to the correct title set (vts), find the track again.
Now when you double click only a hex editor will appear, so alter the sixth byte to match what you
wrote down earlier.