I'm having the same problem as many other people with the sound being choppy during cutscenes. Gameplay is fine though. I keep seeing the same solution, "Turn off DX11" but there is no such option in the launcher settings. Maybe it's because my GPU doesn't have DX11? Still, even with everything turned down the cutscenes are broken.
I actually managed to fix this on my computer by doing the following: Control Panel > Hardware and Sound > Sound > [Choose Playback Device (i. e. your speakers)] > Advanced > [Select 24 bit, 44100 Hz (Studio Quality).
I had the exact same problem and no changes within the game's launcher would make a difference. I did the above steps and the problem stopped immediately.