Watch on the official Unity learn pages here –
http://unity3d.com/learn/tutorials/modules/beginner/5-pre-order-beta/audiomixer-and-audiomixer-groups
AudioMixers allow us to control the signal flow of audio sources in a Unity project. Using an AudioMixer one can change volume levels, route signals into groups and process sounds with audio effects. In this lesson we’ll cover the basics of creating and configuring AudioMixers including assigning audio sources to groups, routing groups into one another and routing AudioMixers into other audio mixers.
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