I think those are output ports. Probably 1/8th headphone size jacks.
My SB Audigy 2 NX also has these 1/8th jacks. I'm plugging in 1/8th to RCA adapters and running RCA cables to my 4 channel amp and 2 channel sub amp(uses left RCA only)
If you plug in 1/8th to RCA in those, you should get 6 RCA connector heads out.
The rear goes tot he rear 4 ch amp channel etc...that was you will have surround sound.