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Since turning on the IWHBYD... skull gives alternative dialog, that might work. I've heard Covenant speaking non-human(?) without that skull setting, although it often sounds suspiciously like English. I think it depends on the mission and how close you are to the aliens, too. Have you chosen under Start/Audio options to have your headphones project proximity sounds? Next time you're in Campaign, try putting on the IWBYD Skull.

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