Hi! This is my first post on these forums
I have a similar setup; we have the same soundcard and we both use Sid. I'm experiencing the exact same problems as you are. I don't know what the problem is, but we can try to find out.
Here's a list of some random information:
1) Works perfectly fine in Windows
2) Works perfectly fine in Ubuntu 5.04
3) Works perfectly in Gentoo
4) Worked perfectly for a few days in Debian, but then it broke
Some recent activities:
1) I have compiled and installed several new kernels, I have 2.6.8, 2.6.11, and 2.6.12 installed at the moment. I have also installed and tried the prebuilt 2.6.12 kernel image.
This is all I can think of at the moment. Have you possibly installed (maybe compiled) a custom kernel lately?