4-speaker sound not working

Hi Viewers,

I'm hoping someone can help me out with the only remaining niggle (hopefully) 
that I have with my very first Linux install. I am using SUSE Linux 
Professional 9.1 and having problems with 4-speaker sound. Basically only my 
front speakers work, the two rear speakers are silent. 

YaST picked the CS4614/22/24 CrystalClear Sound Fusion Audio Accelerator 
driver for my Videologic Sonic Fury soundcard. This works beautifully with 
two speakers, however I do feel slightly cheated that only half my speaker 
system is actually playing ball! I have mucked about with all the different 
sound levels in YaST but the two rear speakers continue to make as much noise 
as a dead parrot encased in cotton wool. 

Please can somebody let me know if they have had the same problem with 
4-speakers under SUSE 9.1 and if so did they manage to sort it out? Please be 
gentle with your response. As I mentioned at the start of this message, this 
is my first Linux install and it is one hell of a sharp learning curve for 
this here user!
-- 
David
   
   .~.
  / ^ \
 /|     |\ simply change
 .\     /.
   .^.