constructor( listener ) {

		super( listener );

		/**
		 * The panner node represents the location, direction, and behavior of an audio
		 * source in 3D space.
		 *
		 * @type {PannerNode}
		 * @readonly
		 */
		this.panner = this.context.createPanner();
		this.panner.panningModel = 'HRTF';
		this.panner.connect( this.gain );

	}
Constructs a positional audio.

@param {AudioListener} listener - The global audio listener.