Where do you get the cables which will split the outputs (some look like they carry 3 signals plus ground) to RCA-type connections?
Those are just standard video camera cable. They come with a 3.5mm triple conductor jack at one end and a yellow, red, white RCA jack at the other. On my website, under the music ditro page, about mid-way down (under System Wiring), I have a drawing of the interconnects between all the components. I have included Steren part numbers for all the 3.5mm --> RCA cables. Calrad also sells their own brand.
Just make sure also that if your going to go with an Audigy or Live, that it is compatible with the KX drivers. On the KX website, there is a compatibility list that it very thorough and up to date.
But seriously, unless you are going for more zones, stick with the M-audio setup as that card is far more superior in quality, spec wise, than the Audigy/Live platform. I just don't know how polished it is for controlling via xlobby.