As far as I know it is a matter of dumping .mp3 or .ogg (and maybe .wav) files in the SilentHunterIII\data\Sound\Gramophone folder. (I've never heard of a text file that needs to contail filenames or anything. For ingame sounds there is a binary .SDL file in the Sound folder though) I don't have NYGM but I doubt it is any different than GWX or other mods.
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