Individual filters can be applied to each audio source for an even richer audio experience. Also, if the listener is within one or multiple Reverb Zones, reverberation is applied to the source. This can be controlled over distance with falloff curves. The audio can be spread out between speakers (stereo to 7.1) ( Spread) and morphed between 3D and 2D ( SpatialBlend).
The audio source can play any type of Audio Clip and can be configured to play these as 2D, 3D, or as a mixture ( SpatialBlend). The clip can be played to an audio listener or through an audio mixer.
In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. Think of each unique Scene file as a unique level. The Audio Source plays back an Audio Clip in the scene A Scene contains the environments and menus of your game.