This is pure speculation. Backtrack is a Slax live cd based distro. I have only been messing with it for a few weeks. How exactly did you install these drivers. I had to build a module for ethereal to work on my machine. I am not 100% sure, but I believe you would have to do the same for your machine.
Also after an install sound cards need configured as root:
Then as user adjust settings:
Then as root (not sure about this been awhile):
1.Does anyone know how to get the actual version and details of your sound card?
2.In case that i have to unistall the old drivers what i do?
lspci should work for question 1.
As far as question 2 it really depends on the install method.
There is on the bactrack homepage a tutorial on making and installing a module.I know this is not a rock solid answer for you, but I hope it helps some.