Examples of the Attenuation Shapes available can be found below along with sample use cases.
Use case: The default volume and is good for most usage scenarios, like ambient outside sounds (fires, birds, streams, etc.)
Use case: This could be used for hallways or other narrow passages. Could also be used to simulate riding in a train car.
Use case: Good for containing a sound within a normal squared room (dropping the box down in the image above would encapsulate the square room).
Use case: Good for projecting sound at a player as the sound is at its max when inside the cone in front of the origin, directly behind the origin results in silence (the example above could represent a security camera which tracks the player).