Didn't think I'd find it so soon, but the voice sample(s) from the Sonic Dive track comes from Spectrasonics "Symphony of Voices". Actually, most, if not all voice samples from the track is in the volume "BOY PHRAS" on disc 3.
The first voice sample on the Xenosaga II track is also from that same volume. I bet I'll find some more from the sample library used in the Xenosaga II track (there's 5 discs..). Will update the first post later today.
EDIT: Found one sample from Koudelka as well (took me like two hours to figure out where I heard it, but yeah!)
EDIT 2: Please, if you post track titles, use the titles as printed on the covers!