So from what I understand, the MBP has a "Mini-Jack" with optical audio out. (Fiber-Optic I presume?) I even saw a red light in the hole today when I unplugged my headphones. I'm wanting to hook up a 5.1 sound system to it. What cable(s) do I need to do so? I looked on apples website and found nothing. I also searched MRoogle but to no avail. Options? Thanks!