The Xbox version of the game had this system where sounds such as gunshots and footsteps would sound different depending on where you were (inside a building, cave, outside etc.) It can be enabled via the ini setting bEnableEnviroEffectsOnPC=1, but it doesn't work properly. This video goes into a bit more detail about it. https://youtu.be/ITdQfNXJ8Kk?t=167 Considering the crazy things modders have done in the last couple years, I was wondering if it would be possible to get this working.