With the Debian packaging system you can specify that your packages
come by default from one distribution but you can override this with
packages from other distributions. The concept is called
pinning and after it is set up you can have, for example,
testing as your default release and then include
unstable in /etc/apt/sources.list and install
cdrecord
from unstable with:
# apt-get install cdrecord/unstable
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The following /etc/apt/preferences makes apt-get use
testing unless it is overridden, even though there are
entries for unstable in /etc/apt/sources.list:
Package: *
Pin: release a=testing
Pin-Priority: 900
Package: *
Pin: release o=Debian
Pin-Priority: -10
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