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HTIB: Onkyo S3300 5.1
Computer: Dell Dim. 4700
Soundcard: Rocketfish 7.1 PCI

I have my computer connected to the onkyo receiver through optical into soundcard. I've read a lot about DD, DTS, so forth. However, When installed the accompanying audio controls, have set it out to digital only, 5.1, and ran the speaker test. Front left and right seem to get a signal but the center, and surround left and right do not get picked up. Seems as its playing 2.1 Any help is much appreciated! what am i doing wrong?