Actually by default (with a hd install) it doesn't. http://www.knoppix.net/forum/viewtopic.php?t=2173#10717 There are a number of threads at knoppix.net talking about setting up Alsa correctly after installing it yo your hard drive. My experience (yours obviously will vary) suggests you may be better off going with one of the really nice sound distros instead of knoppix (planet ccrma, http://www-ccrma.stanford.edu/planetccrma/software/ and Agnula, http://www.agnula.org are the 2 I tried, I ended up with Agnula (debian) for a bunch of little reasons) Knoppix is great (My wife uses it on her laptop and I use it on an old laptop without a harddrive, as an X client to my sound machine) but its not very realtime sound app friendly, and I don't know enough super geek stuff to make it so (not yet at least) m.