Cant un-mute?

[Christian Peter]

I dont see the option to un mute the video, I only found this and still not working...
var DEFAULTS = { volume: 1, playbackRate: 1, muted: false, loop: true, autoplay: true, position: '50% 50%', posterType: 'detect', resizing: true, bgColor: 'transparent', className: '' };

Thanks for your time