Voice modding in Sonic Adventure 2 Battle Rom for the GameCube

Context: What i want to do is take all the voice files in the game Sonic Adventure 2 Battle for the GameCube and replace them with my own voice. My problem is that ive only found one voice file in “.afs” in the “root” file using gcrebuilder. Where are the other voice files?
what ive done: ive taken all the “.prs” files and tried to decompress them to see what they with a python coding that Chatgpt gave me but all i get in Command prompt is “Skippiing invalid PRS file:” and then “Invalid PRS: ”
Can someone please guide me with what i want to do