Sblive, emu10k1 SPDIF and rear output (OSS/Alsa)

[Nico]

i all,
i have an sb live 1024 (4.1)
classical analog sound works great (rear work with alsa drivers)
but when i tried to pass into digital out (SPDIF coax) linked to my 
dolby decoder there is
no sound on rear.
i tried emu-tools and sbconf (a gui for emu-tools) but i cant have sound 
on rear under digital mode.

can someone help me with this ?

i have tried to play sound just on rear but dsp et dsp1 do the same (but 
no rear)
rear is in a very low level and sound (noise) is not clear.
ls -al /dev/dsp*
crw-------    1 root     root      14,   3 sep 15 15:40 /dev/dsp
crw-------    1 root     root      14,  19 sep 15 15:40 /dev/dsp1
crw-------    1 root     root      55,   0 sep 15 15:40 /dev/dsp56k

i would buy a 5.1 card in the next months ( if you have a good one with 
works great with SPDIF out im interested)

Thks