package searching & soundcard issues

[Mark Phillips <mitb@escape.ca>]

hello,

question 1:
does anyone know how to go about finding what package a file belongs to
when the package is not currently installed?  i remember seeing a method
to do this a little while back, i think it involved downloading and
zgrepping a file called Packages.gz or something, but i can't seem to find
the file anymore.

question 2:
on my debian installation, root seems to be the only user who can access
the soundcard (with xmms, etc.).  if i'm not mistaken, the souncard is
/dev/dsp. on my machine this is:

crw-rw----    1 root     audio     14,   3 Jul  5  2000 /dev/dsp

i tried doing an `addgroup mark audio', but i still get `Permission
denied' when i try `cat /dev/dsp'.  can anyone give me a hand?  thanks.

-mark