Anyone have any luck with this speaker setup?

Hey gang, Has anyone had any luck getting all 6 speakers of a Logitech Z-640 system working? If so, what sound card are you using? I've checked hardware compatibility, and my Audigy2 isn't supported (though it does work with 3 speakers, the 2 front (or rear?) and the bass), but I've read some folk here say the Audigy2 ZS Platinum Pro has worked, I think. I've got the latest ALSA drivers on this 9.3 system and it made no difference. Thanks for any feedback. John B.