Ripping Xenosaga 1 audio?

Hey, I’m working on something right now that requires me to have access to the Japanese in-battle voice lines from Xenosaga Episode 1. All of the equivalent English lines have been ripped by somebody on Sounds Resource, but I have yet to figure out how they did so, and I’m not certain how to do it myself. I’ve extracted all the game files using the Xenosaga Disc Tools, but I do not know how to read the actual audio files that the program outputs.

I would really prefer not to scour gameplay footage for the voice lines, so if someone more well-informed than me could let me know how the game’s audio files work I would appreciate it a lot!

I think these need to be converted from a proprietary format. It’s been a long time since I monkied with the XSI kit, if I recall there’s a conversion tool in there that works for the video and audio but it was made for a FIFA game. But I’m working on a companion kit to the II/III one that should address some of this.