THREE.js Sound plays only once. How to make loop playing?

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Javascript

var mesh1 = new THREE.Mesh( new THREE.BoxGeometry(2,2,2),new THREE.MeshBasicMaterial());
 mesh1.position.set( 0, -100, 0 );
 SCENE.add( mesh1 );

 var sound1 = new THREE.Audio( AudioListener );
 sound1.load( 'sounds/Soundtrak.ogg' );
 sound1.setRefDistance( 2000 );
 sound1.loop = true;
 sound1.autoplay = true;
 mesh1.add( sound1 );

This code plays sound only ones. How make sound loop playing?
I did like in example: http://threejs.org/examples/#misc_sound
But sound plays once then stop.
Please help. Cheers.