Creating an audio listener
Each scene should only have one RACAudioListener.
To create a new audio listener add the RACAudioListener component to a GameObject in your scene.
It should be placed at the position of the player's camera (first person perspective) or head (third person perspective) as the transform of this GameObject will be used to position the audio listener in 3D space.
This will also add an AudioListener component if there is not one already.
Only one AudioListener is allowed per scene.
If an AudioListener is already present on a different GameObject, you will need to remove it before adding the RACAudioListener.