You could create a suitable configuration file /home/knoppix/.asoundrc and restart the desktop environment with the key combination Ctrl-Alt-Backspace.
How can I change the default sound card to one of the USB after boot (due problems with Xonar HDAV configuration), without touching HDD?
You could create a suitable configuration file /home/knoppix/.asoundrc and restart the desktop environment with the key combination Ctrl-Alt-Backspace.

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