I have a 5.1 system for my computer but I would like to be able to use it with my TV for my DVD player and such. Now I've looked into a little bit and it appears that I need a digital decoder to do this, since my speakers have three plugs, front/rear/center:sub. I saw some suggestions for something like the Creative Decoder DDTS-100, but it is discontinued and impossible to find. Do you guys have any suggestion on how to do this?