Another update for my "case"

Coming from Windows world, I assume things to be similar in Mac Os, but it's not, and I discover later my misunderstanding

I was complaining that my audio needed some bass, and I figured out that in fact I had only some stereo basic output, but I'm using 5.1 speakers (without rear speakers plugged), so no bass were delivered to the woofer, or some little.
I tried different kexts, and found only one that could create 3 stereo outputs to be merged by an aggregate device, to get 5.1. (I can't find the file anymore on the forum, I searched and tried so much, and didn't bookmark the page, but it's a taruga ALC883-3channel output file)
It finally works, bassy groovy and so on, but the only problem is that now I get Kernel Panic on shutdown.
What could be the cause of that problem ?
Can it be because it's patching an older AppleHDA, included in the zip, than my actuel Leopard 10.5.7 ?
Master chief, I've read your work linked previously, but I can't really understand the whole purpose of it.
Just by following your guide, am I able to make some kind of driver based on my actual config that would definitely work ?
Thanks again