Similarly to the Music System, the package includes a prefabs to help with the setup of background ambient sounds.

Different areas of your level might need different ambients. The ambient system will fade in/out nicely between clips as you go into these areas.

Simply instantiate the prefab Ambient Area into your scene.

Adjust the trigger size to cover the desired area

Adjust the numbers on Push/Pop calls on the ColliderObserver, which define the Fade In/Out duration.