I have four Audio Buses -- SFX, Narration, Music and Atmosphere.
My atmospheric wind loop is quite loud so set it to about -20 in the Audio bus as shown below:

In the screen shot above, I set it to playing so you can see it's channeling through the correct bus due to the color coding. Yet when I run the app -- at least in through the IDE's debugger, the volume is not being decreased at all. I thought it might have to due with it initially being setup for autoplay but even after I changed that so that it is manually started via play() on its _on_ready event, it is not lowering its volume at all.
Any help on this would be greatly appreciated.
EDIT: Just answered my own question. Apparently while Godot allows you to set volumes in the IDE they aren't applied to the run app and you need to set your initial values on program launch...