How can I dampen ambient sounds when indoors?

Thanks for info ,

It certainly sounds like what I’m looking for, but it doesn’t seem to have any effect on audio in my scene.

I have an ambient sound outside of reverb volume and my character is inside reverb volume with settings attached. I’ve also seen somewhere that I need to rebuild geometry for reverb volumes, so I did that too. (I have played around with volumes and LowFrequency pass settings as well, but nothing seems to change)

Any idea what I’m doing wrong?