Systems Implemented:

Voice management system that enables/disables audio sources as they enter and exit the player's listening range.
Ambient system controller that seamlessly transitions between above water ambience and underwater ambience.
Bird call generator that randomly spawns bird calls from birds within the player's listening range.
Wind audio generation system that randomly spawns wind gusts and moves them between points in the scene, mimicking the feeling of wind moving through the air.
Trigger system that applies a new audio mix when the player enters/exits buildings.