Best Way to add room tones in complicated space?

Hey guys

I'm trying to add some room tone for different rooms but the geometry of the room is pretty complicated. I'm struggling to find an easy way to change snapshots with the different room regions using box colliders. For example, most of my rooms aren't squares so I have little pockets where it's nearly impossible to trigger the room ambience. Help!!

 

after some research it looks like im going to have to use Mesh Colliders.. Would love some help on how to make those work with audio and in general.

 

Wouldn't it be easier (and be less of a performance hog) if you just activated the ambient sound upon entering the room, and deactivate it upon exiting?

 

For this kind of jobs, I'm building sort of a portal prefab consisting of two parallel triggers. When you reach the entry trigger, you launch you room tone, you disable the entry and enable the out trigger (which stops the room tone, or play another ambience, whatever). That's a fastidious but necessary process. Hope that helps