Since Xan's release for BG2, quite a few players asked to preserve old BG1 soundset for Xan in BG2. Well, better late than never, they say, so here it is, available here
It's not an exact copy of the soundset used in BG1 NPC, because it uses "rare" lines by BG1 actor, Jeff Bennett, as well as "regular" ones. (The rare ones being "It is hardly worth the effort of trying", "We delude ourselves to think our pitiable band will stand up to our enemies", "I'll do what I can, but expect very little", and, of course, "Let us save our effort and just lie down and die").
A reminder: French and Polish players can enjoy BG2 soundsets for Xan in their own language(there are actually two soundsets for Polish players: the "official" one and the one by Lava Lava Del'Vortel). And for those who enjoy Xan's BG2 actor, SisterVigilante, you can take your BG2 soundset into your BG1 playing experience, as well.
All Xan soundsets are available here: http://www.pocketplane/audio