I am using mandrake, and here is how I got it done:
First, I had already manually upgraded to the 2.4.18 kernel.
The kernel that comes with Mandrake 8.1 does not have support
for this device, but it is in 2.4.18. It uses the Phillipes webcam module.
PWC for visuals. You can compile it yourself, but it will in modern distributions
usually come with the set. Just modprobe pwc if for any reason it doesn't
do it automatically. Then there is a module simply called "audio" which is going
to handle the microphone. It's the USB audio module, named "audio."
If you have an old kernel and these modules are not present, than you
should upgrade your kernel manually or upgrade your distro.
As for you conflicts with your sound card, you may want to try disabling the
audio module as it may be at fault. I doubt the PWC moduel required for
video is at failt for that.
http://www.smcc.demon.nl/webcam/