enable audio 5.1

[dax@arch]

hi at all,
i'm new in this forum.
i'm writing for help to enable audio 5.1 on my archlinux.

first of all, i have searched on google/linux and here but without great results.
on this page i have found a wiki @Italain:
Hardware supportato - Linux@P2P Forum Italia

following this wiki i have created a ~./asoundrc with this line
pcm.!default {
type plug
slave.pcm "surround51"
slave.channels 6
route_policy duplicate
}

restarted x i see this error:
Sound server informational message:
Error while initializing the sound driver:
Unable to set interleaved!
The sound server will continue, using the null output device.

i have changed somethink with alsamixer but really i don't know what i have changed and i don't know how to turn back to default settings.
i'm not so expert of this kind of settings. help me please.

finally something that could be usefull:
[dax@feeder ~]$ lspci | grep audio
00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller (rev 02)
[dax@feeder ~]$ lsmod | grep snd
snd_intel8x0 28700 1
snd_ac97_codec 95780 1 snd_intel8x0
ac97_bus 2432 1 snd_ac97_codec
snd_pcm 69124 2 snd_intel8x0,snd_ac97_codec
snd_timer 19076 1 snd_pcm
snd 44516 6 snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer
soundcore 6368 1 snd
snd_page_alloc 7816 2 snd_intel8x0,snd_pcm


thanks for the time spent reading this.
bb

[Tutku]

for returning the default settings, you can delete ~/.asoundrc file.

with alsamixer, you only change the sound levels, so it is not so important, and after changing with the alsamixer, you have to use

alsactl store

command to save the new settings, if you didn't use this command, your alsamixer still has default settings.

[dax@arch]

thanks man, i have tryed this way but don't have solved my problem.
since i have written this post i've made something.
also i've written a post into archlinux forum, here:
Arch Linux Forums / kit audio 5.1 problem with speaker-test and kde

could /etc/asound.state be usefull to help me?
if need is here: nopaste: pastebin with syntax highlighting