Halo 3 Flight no sound once in game

for the Halo 3 pc flight, I have sound and everything even in the menus but once I get into the actual game there is no sound or anything in the cutscenes. If I go into the menus in game I can hear sound when I hover over a button but other than that there is no sound I’ve tried switching to different devices and switching back, I’ve restarted but it’s still happening.

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