Same sound as other version just lowered the highs in EQ to make a more muffled effect.
Unzip mokia-muffled.ba2 into fallout data folder.

Unzip mokia.ba2 into fallout data folder.

Sample fallout76custom ini file. Feel free to modify your existing one. If you do not have an existing one, use this one.

Place into fallout76 documents location not game data location. for example C:\Users\rocmanx\Documents\My Games\Fallout 76\