My station now streams "radio" in 5.1 and I can't get the centre and rear speakers to cooperate. Is this problem unique because it's being streamed or am I badly set up? I've tried with the .asoundrc below but I'm a little short on info on setting up speakers.

In that other OS I hear that the wiring is OK, so what's left to do with my Gentoo Linux?

mplayer -channels 6 -playlist nrk51test.pls

Gentoo source kernel 2.6.17-r8 (yeah old, I'm stuck due to a bug)
Speakers: Creative G500
Soundcard: ditto Audigy4 (non pro)

.asoundrc
pcm.emu10k1 {
           type hw
           card 0
        }

        ctl.emu10k1 {
           type hw
           card 0
        }