The output of the 'cat' command gives you the number of the sound device that ALSA uses to identify the particular audio device. It is the number before the name inside the brackets. The default device should have the number 0 and the sound card number 1 should be the device you want to use. Thus I would create a configuration file /home/knoppix/.asoundrc with the two lines
Code:
defaults.ctl.card 1
defaults.pcm.card 1
If there is still no sound I would try the programm alsamixer to adjust the volume. Do not forget to the select the correct sound card before you change the sound volume or to restart the graphical desktop environment. In most cases the key combination Ctrl-Alt-Backspace should restart the desktop environment.