Consegui configurar as preferências do apt, mas não tenho certeza se fiz isso corretamente. Então basicamente o que eu quero é, se eu tiver necessidade, quero instalar pacotes de TESTING, UNSTABLE e DEB-MULTIMEDIA e que (SOMENTE) esses pacotes também recebam atualizações do Repo específico. Mas como "base" quero ter a versão STABLE. Seria bom se alguém pudesse verificar se configurei isso corretamente, porque não tenho certeza de como funciona o Pin-Priority...
então este é meu sources.list
## CRUNCHBANG
## Compatible with Debian Wheezy, but use at your own risk.
deb http://packages.crunchbang.org/waldorf waldorf main
#deb-src http://packages.crunchbang.org/waldorf waldorf main
## DEBIAN-STABLE
deb http://ftp.cz.debian.org/debian stable main contrib non-free
#deb-src http://http.debian.net/debian wheezy main contrib non-free
## DEBIAN-BACKPORTS
deb http://http.debian.net/debian wheezy-backports main contrib non-free
## DEBIAN-TESTING
deb http://ftp.cz.debian.org/debian testing main contrib non-free
## DEBIAN-UNSTABLE
deb http://ftp.cz.debian.org/debian unstable main contrib non-free
## DEBIAN MULTIMEDIA
#deb http://www.deb-multimedia.org wheezy main non-free
## DEBIAN SECURITY
deb http://security.debian.org/ wheezy/updates main contrib
#deb-src http://security.debian.org/ wheezy/updates main
e meu apt/preferências
Package: *
Pin: release a=waldorf
Pin-Priority: 1001
Package: *
Pin: release a=stable
Pin-Priority: 800
Package: *
Pin: release a=wheezy-backports
Pin-Priority: 650
Package: *
Pin: release a=testing
Pin-Priority: 400
Package: *
Pin: release a=unstable
Pin-Priority: 90
Package: *
Pin: origin *.deb-multimedia.org
Pin-Priority: 10