My suggestion would be to add five sliders. These are default in many games (except the weapon/caller, which are special here):
Weapons: too quiet by default
Caller: tooo loud by default (louder than weapons!!). For some callers i reduce the volume by half when using often. But than you do not hear all other stuff.
World: birds & co. (sometimes too loud for me)
Weather: like wind (i like wind...it's too quiet for me)
Player Steps & Bushes: too loud for me. You miss quiet sound of the animals