Player hitting sounds cannot be lowered without using master volume

The noise the player makes when hitting another mob is very loud and obnoxious. I'm talking about the "thunk" and "swoop" sounds.

I decided to go into "Music & Sounds" to lower it. I'd rather not turn down all player sounds due to how important they are, but I assumed that I had no choice.

It turns out that none of the volume sliders except "Master Volume" affect the hit sound in any way! I tried putting all the other sliders to 0.