postinst is in osspd-alsa 1.3.2-7.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
set -e
update-alternatives --install /usr/lib/osspd/ossp-slave \
ossp-slave /usr/lib/osspd/ossp-alsap 60
exit 0
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