debian/knoppix sources.list

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http://serverfault.com – Knoppix is a Debian-based Linux live DVD. I've liked the pre-installed packages in Knoppix so much, that I've installed it to disk. My question is about /etc/apt/sources.list In Knoppix, the sources.list file has MANY repo links, it includes links for stable, testing, unstable and experimental (lenny, squeeze, wheezy, sid...etc), all uncommented. There's a copy of the sources.list file here: http://ghghgh.us/sources.list the strange thing is that in the /etc/apt/apt.conf file, the default release is wheezy, as it says: APT:Default-Release "wheezy"; I'm wondering, should I COMMENT OUT or (HowTos)