Have you tried the latest drivers from Creative? That worked for my SB PCI64.
http://www.soundblaster.com/wwwnew/tech/ftp/ftpnew.html
-don
I had the same problem and got the new Drivers for my 128 and it
didn't help. I found out that there was a patch for the sim and
installed it and the rear speakers started working great. Try out the
new patch from UBI after you get the new sound drivers installed...
Tim
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