@t18, have you tried any other *nix Live distro(s)? or even an older TCL?
if we found a *nix where the soundcard worked "out-of-the-box" then we could establish a possible point of failure.
I wonder which one:
https://en.wikipedia.org/wiki/List_of_live_CDssince my PC is very old and modern distributions run modern kernels.
I'll find the necessary time to try some of them.