Don't throw away your Vortex Card just yet my friend. I managed to compile the drivers you downloaded from sourceforge and then installed the resulting module.
Surprised it worked? You betcha.
Anyway, extract the files from the tarball and you should wind up with a directory called aureal
This will not work, because the makefile is trying to find the linux source code to include it!
Anyway, if you haven't done so already, you need to install the linux source code.
After that, go back as root and try the make instruction again
This will not work either, but at least the error messages are more helpful - they will tell you what to change the first line of the makefile to in order for the source files to be found.
After the changes, the make instruction will work, as will the module instruction.
It will probably complain and say that you have tainted the kernel, but as a newbie myself, who cares. Linux works and my sound card works... Job done.