5.1 Audio with 3 jacks: How to config this ?

Good evening everybody,
I'm having since short a 5.1audio set, a logitech x540. I love this set, not too priced for a 5.1set. I'm coming from some crappy cheap trust 2.1set, so this is a big improvement.
But now the problem: my set needs to be connected to my motherboard with those '3 jack cables', because it's not having a coax cable. (normal for a budget set). But my motherboard has got only those 3 'normal' jacks. But not a big problem, i found the following in my motherboard guide:
Light Blue : Surround
Lime    : Front Speaker Out
Pink : Center/bass
So hardware seen it isn't a problem to use those jacks . So i connected them like told in my motherboard manual. But now i don't get them working under linux. I don't know how to config it. I'm having the following audio card:
00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2)
I'm using alsa, so i've searched in alsamixer, but i didn't find anything usefull there. Anybody who can help me with this pls ?

I have a very cheap C-Media PCI CMI8738-MC6 6-channel sound card connected by three jacks to Logitech 5.1 speakers. I also have a headset for Skype connected to the onboard sound.
Here's what I know:
1) To always get the sound card module to load before the onboard sound module, I have added snd_cmipci to my "modules" list in /etc/rc.conf. This means the cmi card is always card 0, the module for the onboard sound gets loaded automatically later.
2) I have ~.asoundrc as follows:
# 6 channel dmix:
pcm.dmix6 {
type dmix
ipc_key 1024
ipc_key_add_uid false
ipc_perm 0660
slave {
pcm "hw:0,1"
rate 48000
channels 6
period_time 0
period_size 1024
buffer_time 0
buffer_size 5120
# upmixing:
pcm.ch51dup {
type route
slave.pcm dmix6
slave.channels 6
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
ttable.0.4 0.5
ttable.1.4 0.5
ttable.0.5 0.5
ttable.1.5 0.5
pcm.duplex {
type asym
playback.pcm "ch51dup" # upmix first
capture.pcm "hw:0"
# change default device:
pcm.!default {
type softvol
slave.pcm "duplex"
control {
name "Software Master"
card 0
# for aoss
pcm.dsp "duplex"
pcm.dsp1 "duplex"
3) To allow amarok to play each speaker individually using a 6 channel DTS .wav file I added the following to my ~.xine/config
audio.device.alsa_surround51_device:plughw:0,1
4) You can download a 60MB 6-channel DTS test file here. It is in swedish but tests each speaker individually.
My info came from browsing the Alsa wiki

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