help with 5.1 on Ubuntu

Hi there! I've got ubuntu 7.10, a soundblaster audigy value 5.1 card and logitech 5.1 surround speakers. I get sound out of the front two speakers and subwoofer but nothing on the back. I'm sure its a configuration issue and I've been searching, but the problem is the instructions already assume you know where things like asoundrc are and how to configure them. I'm new to ubuntu (love it) and this is the only thing that is giving me headaches. I'd really appreciate some help if possible.

Thanks
Cypher

This should help you:

Matrix:Module-ca0106 - AlsaProject

If you already have alsa installed then copy this into your .asoundrc file:

pcm.ca0106 {
type hw
card 0
}

ctl.ca0106 {
type hw
card 0
}

pcm.!default {
type plug
slave.pcm surround51
slave.channels 6
route_policy duplicate
}

To make an .asoundrc file use your favorite text editor. And then save it as .asoundrc

hope this helped