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I think you would need to get sounds.bif, xp1_sounds.bif, xp2_sounds.bif, and voicesets.bif from someone. If you still had a problem, then it's not missing audio files, it's messed up reference files (and I don't know how those are referenced).
Just checked, I can pick from all the voices in the toolset-but the ones that I can't hear ig are also not audible in the toolset