I absolutely second this. Quite often, there are pilots extremely loud for me. Then I ask the ATC if it’s loud for him aswell, he replied “no”. 
Tried everything I could: disable/enable realistic VHF effects, and tried the other sound option in vPilot aswell (can’t remember right now which the other option is though)…
Limiting the max. dB(A) volume with windows setting is only able for the speakers I use but not for the Logitech G935 I’m using. It comes with separate software and not even with it, I can’t limit it. Then I had looked for external 3rd party software but as it seems there’s nothing available on the internet.
I tried to raise awareness for this health threatening issue quite some time ago but I felt like I was almost the only one seeing this as an issue: Limit max. Volume of vPilot Audio?