The elevation property describes the position of a sound source along the vertical axis of the listener's environment.
Possible Values:
angle: Angle values are in the range -90deg to 90deg. An angle value of 0deg corresponds to a point which is level with the listener, whereas 90deg corresponds to a point directly above, and -90deg directly below.
above: Equivalent to the value 90deg.
level: Equivalent to the value 0deg.
below: Equivalent to the value -90deg.
higher: Causes the sound source to be shifted upwards by 10deg.
lower: Causes the sound source to be shifted downwards by 10deg.