I'm not preserving the pitch, I couldn't find any software that was competant enough at time stretching whilst preserving pitch, they all introduced glitches into the audio so I decided I'd rather have undamaged but slightly faster audio than damaged but correct pitch audio.

The wav file I use for the PAL DVD is for 23.976fps footage and I use BeSweet to increase the playback speed for 25fps whilst encoding to AC3, there's zero problems with audio sync by using BeSweet to do the speedup, once you've synced the definitive wav audio to the PAL capture - took me about 3 hours, going through it almost scene by scene...
I've now done a test disc of ANH with 2.0 audio, looks and sound great. I'll be doing a 5.1 upmix of the 2.0 audio soon, then work on menus/chapter points etc. (the annoying bit of making DVDs

), it'll have 2.0 and 5.1 on the disc.