My Tecra 8000 with Red Hat 9 did not recognize the sound card either.
the answer is a small app sndconfig
run sndconfig as root and configure the card as a SoundBlaster 16.
The utility has a test function so you can try different settings.
A check of my PC running SuSE 9 confirms that sndconfig exists on SuSE also
dont even try the built in Winmodem