Please add advanced audio settings for effects, it's really bad approach to have so many things in one slider.
Split it into Enviromental, Gunfire and Effects.
Splitting Environmental sounds is most important, because they are really quiet and other sounds are too loud!
This is really important for MP experience, because most people lower the volume to hear each other over the gunfire, but they will miss the beautiful Environmental sounds.
This is also very important for advanced sounds mod, ability to mix the audio to get the best setting for great audio experience is really important.