sound documentation for the snd_hda (Nvidia)

[Chuck Robey]

I have a Asus motherboard, a Striker Extreme, which has a Nvidia 
chipset, and the Analog Devices 1988b IC.  What I'm getting at is, I'm 
not getting all that I could be getting out of it, and I want to know 
more about the hardware and software that I'm using.  I was wondering if 
the folks who originally write the snd_hda driver, that's only for the 
Nvidia & Analog Devices hardware?  What documentation did they work with 
to write that driver?

Nvidia sells *something* (and I know precious little about that 
*something*) that's supposed to improve the sound system.  I don't want 
to pay Asus for it until I know whether or not it's needed for the 
FreeBSD driver, or if having it could help me in any way whatsoever.  If 
it would help, Id buy it, but until I know that, I really hate feeling 
like a prize chump, paying them for Windows software that I'd never make 
use of (I never run any M$ software).

More than just that, I want & need whatever docs were used to form the 
snd_hda driver.  I'd really, really appreciate any info on that you have.

Thanks.