Wouter Klouwen wrote:
> Which leads my to my question. Is there any simple sound card driver which I
> could use as a guide on how things should work, or any documentation on sound
> card drivers?

Did you read Jochen Kunz' documentation for driver writers? I think it
does not cover audio drivers but should be useful nevertheless.

  http://www.unixag-kl.fh-kl.de/~jkunz/NetBSD/

ciao
     Klaus