Hey guys, just got my brand new iMac. I have 5.1 Logitech with the 3 optical cables. Black,green,orange. But iMac has only one port. I cane across this: http://item.mobileweb.ebay.com/viewitem?itemId=280948392076 Will this work for me in combination with the toslink for true surround sound from my 5.1 speakers?