I have a gamecube is there any device that would let me hook up my gamecube rca jacks and then send it to a optical in on my surround sound system.
If anything try this website out www.amabilidade2002.com/toslink7.htm. Or you can just connect your gamecube to your tv. Then your tv to your surround sound system. I assume you have a home audio receiver. If you do then just connect your tv to the receiver. Anything connected to tv will get access to your surround sound system. You will need to set your receiver to the tv/sat mode in order for it to work.