Audio Volume Scaling is Bizarre!
I have one sound that's reasonably unobtrusive, FM type sound but I wanted to mute it a little.
I got down from the default setting of 100 to just 3 before getting a desirable result. And that's not much actual shift in volume. Probably about a 50% reduction in actual output volume, or thereabouts.
Other sounds respond a little more accurately to volume settings, but all have the same basic problem, it's difficult to know how to get a 50% reduction in volume because that's not achievable with the literal numbers, requiring far lower numbers than that.