If you prefer digital connections, the DX's S/PDIF output is shared with its analog line and mic input port. A digital S/PDIF input port isn't provided on the port cluster, but the card does feature a four-pin auxiliary input connector.
I'd assume the D1 was the same way, but you might want to check up on that ahead of time. I completly forgot the DX wasn't packaged with a SPDIF input port (though thats normal for budget cards).
And for reasons I've long since stated, I can not and will not ever reccomend a Creative product until they get some driver stability.