To properly change the audio from NTSC to PAL and back (at least for the SW releases I have, like the UK GOUT - I prefer them because they preserver the original film frames), you have to change the duration and pitch. I’ve been using the altered GOUT Audio from the PAL source for TESB and Jedi. It suffers from some distortion. If you are after the 80’s home video experience, this is the way to go. If you are after the theatrical experience, you should set the video to 23.976 fps and use the GOUT audio synced audio.