How can exchange ALSA with OSS?

Dear developers,

Regarding my problem with sound output one of the
answers was that my sound on Knoppix works because
Knoppix uses OSS but Ubuntu uses ALSA.

So I think that the way for me is to "kill" ALSA and install
and/or start OSS.

But to this timepoint I am very confused. There are ALSA, OSS
, esd , kernel modules and many more things. i don't know
where what belongs. What to start, what to do, and so on...

I ask here because here I got at least some answers. On
-users I don't get one useful answer. I think because the
users are not experienced enough. Only fortunately
Ubuntu works for them - on some magical way - .

And, please, I need my sound support: Give me some
advice. I wanted to support Ubuntu but without sound
support - which even on Windows works AND as I said
on every other distro I tried out - I cannot use and therefor
support Ubuntu.

So, please:
What is ALSA? What is OSS? How can I see which is working
on a system which not?
How can I exchange the two? What should I care for? 

a very helpless
debian_noob

PS: All my hardware data you can read in my mail called
"Integration of Module for SiS Sound Controller needed"
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