I am trying to setup a 5.1 speaker system with a receiver (Sony STRDH590 ) to my desktop. I tried to connect the computer and the receiver together via an optical audio cable. When I turned the receiver on it played music, however the left and right sounds where only coming out. I later found out that the optical audio on the computer only supports Left and Right speakers. The only way to use 5.1 sound from my computer are the 3.5mm ports for the speakers in a 5.1 setup. My receiver does not have individual inputs for speakers, so I want to have the input be optical audio. I have a Sound Blaster Recon 3di to process sound to the receiver. I looked for drivers the supports 5.1 optical audio, but I found nothing. If anyone has any ideas how I can move forward feel free to drop a comment. Thanks