Cool, it works with aplay ! But the .asoundrc isn't right, you have to change 
it : 
pcm.ch4dup {
             type plug
             slave.pcm surround40
             ttable.0.0 1
             ttable.0.1 1
             ttable.0.2 1
             ttable.0.3 1
     }
and then
aplay -D ch4dup foo.wav will play the sound on the four speakers !!!
 
Otherwise, I have tried aoss, and it doesn't work. Of course, I have added the 
following line to the .asoundrc file
pcm.dsp0 pcm.ch4dup
and then I have tried "aoss tuxracer", and there was no sound in the game. 
But I use the CVS version of alsa-OSS, so maybe there is a bug, I don't know.
Furthermore, why pcm.dsp0 and not pcm.dsp1 or pcm.dsp2 ?

Thank you very much for your great help !
Xavier


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