The steam version of Medieval 2 has some missing strategy map voice lines. Captains were supposed to have a bit more voice lines AND most notably all Chivalrous generals in Steam have only one "Selected" line per accent (you know, those annoying "For the Reich" and etc.).
Reference One: Third Age Total war has some of those missing voice lines enabled. So any Steam user can hear the missing English captain lines in the mod.
Reference Two: When Legend of Total War was recording a Disc version gameplay those voice lines WERE PRESENT. And not just ones for Captains but Chivalrous generals too.
I am 100% sure this IS a thing, but I found nothing on the internet about it.
When you unpack the steam version those sound files ARE NOT there. They were cut entirely or something.
I really hope someone here can tell me where did the mod get those missing sound files.

For the moderators: I post it here because Third Age uses some of the voice files that the vanilla Steam game does not, thus it is relevant to the mod and I am more likely to get the answers here.