friends microphone throughout all of windows gets lowered

[Jeffison]

Platform: PC (Steam)

Multiplayer or Single Player Game: multiplayer, in total 3 players. all on pc (steam)

Difficulty level: Woah!

Description of issue: hey, my friend is having the problem that his microphone (in general, not just the game) gets quiter when he talks/is loud, but it never goes back up.
only happends in game, and he has the microphone set to "never"

Last thing you did in the game before the issue occurred, if applicable: join my brothers game