Some sounds bypass volume controls

There are a few sounds in the game that don't respect sound settings.
I have my sound effects volume, music volume and ambient sound volume zeroed yet some audio still plays at full volume as if unaffected by the volume controls at all.

Examples:
- Legion enemies have an attack that fires some sort of spinny disc, which makes a noise.
- One of the map bosses (I think stagnation?) has this big thunderous sound that plays during the fight.
- A recently added MTX has a sound that completely ignores volume while in town.