@zeropc: happy you agree with me!
@CatBus: the DTS soundtrack is a "simple" 16bit/48KHz lossy, and takes "only" 1.5GB; but thanks for the offer, if I need such conversion for a future release, I hope you will help me as well!
Well, don't know if the difference is "dramatic", because the DTS level is so higher than AC3, so to be safe, I'll leave it in.
about languages: according to Wikipedia's latest estimates, two out of three say that there are more french and german speakers than japanese, while just one say that italian speakers are more, but you know... I'm from Italy, and italian soundtrack is a "must" for me! (^^,)
Still hoping to find out the german soundtrack, much more preferred against four commentaries (and because I will leave in the fifth one...)