Audio Making a reverb zone 'visible' in play?

Hey folks,

I'm making a project for university looking into reverb in video games. I'm trying to show outlines for 4 reverb zones in-game so there is both visual and auditory feedback to the player when they enter and leave a zone.
Where should I be looking to add a colour to each zone? I feel like I should be adding a mesh to it and going from there but I'm an audio guy, not a Unity guy... whoops.

Any advice would be awesome!

Luke

 

Well, you could turn on gizmos in game and draw a sphere. Since reverb zones are spherical too, you can check if the player is within distance and then change color of the gizmo.