Unity 3 Feature video "Audio Features" is up on design3.
Learn about Unity's versatile audio engine and how to utilize it. We'll walk through all the properties of the Audio Source component including 3D Sound Settings and Volume, Pitch, and Pan falloff curves. We'll also use filters to create bandpass, echo, distortion, chorus, and reverb effects. Lastly, we'll create Reverb Zones to dynamically modify the tone and character of your sounds in-game.