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This has made it into my Top 10 Anime Plot Twists.
Are you sharing faction ranks across all players in your config.lua?
Consider referring to this similar thread.
One easy way to find out... can you install regular singleplayer OpenMW and check if the sound works fine in it?
Why don't you try it out and report back? There are thousands and thousands of mods out there, and we're not going to get very far with threads that just ask whether specific ones work.