Using Mitsu's latest soundpack, I decided the sounds of getting hit were far too loud after playing with it for a week or two. So, I closed my game, opened up the sounds configuration file in Notepad, changed these values down from 1.0...
0.600000,hit
0.650000,hit_5
0.700000,hit_6
...saved it, restarted my game, and now my speakers need to be turned up twice as much to hear any sound coming from the client at the previous levels. That includes VOX, engine noises, guns, music...anything. I've checked, and the game's master volume and my system volume are both still 100%, as they have been for years.
DxDiag