I looked at the manual for the Audigy 2 ZS online. If you have one of the drive units (Platinum or Platinum Pro), then you've got an optical digital output that would be the easiest way to connect it to the 950 -- connect that output to one of the 950's optical inputs and assign that input to the source you want to use for the PC. If you only have the card, you need an adapter or special cable (listed as "3.50 mm (1/8-inch) mono-to-RCA cable (available separately)" in the manual) to connect the digital out mini-plug to a coaxial digital input on the 950. I looked around SoundBlaster's site, but couldn't find the cable listed there.

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review