Quanta ZW9 Laptop + onboard sound + alsa

Greetings

I was wondering, but first some background, I manufacture computers and 
laptops. Background finished.

I am running the above mentioned laptop, which we manufacture by the hundreds.
In windows the drivers give you the option to configure  the type of sound 
mode the sound card should be run in. 

What I would like to know is how to configure my working sound card so that 
the mic jack is subwoofer/center out and the Line-in jack as the rear 
surround, and the audio out stays the same,
This is so that I can run (brag brag Sorry :) ) my logitech Z5500 sound 
system. As my PC with SB Live exploded in a storm the outher day ( I was not 
home) and now I have no usable sound system.

I have had a look at the alsa doc but am not sure what category this falls 
under.

The archive for this list are searchable so don't blast me if its been asked 
before.


Thanks 
Chad