The saa7134 tv module would be helpful.
It supports a number of TV cards and its especially
useful as it's very easy to get audio off the card
(/dev/dsp1, line 3) rather than through a separate soundcard.

http://www.bytesex.org

Same place as for xawtv, bttv and v4l2 drivers
(didn't check whether Knoppix is using v4l2,
but v4l2 lets multiple programs access a device
at the same time, letting you scan channels with
one program while recording with another, etc.)