/usr/lib/x86_64-linux-gnu/roaraudio/complibs/liboss.so is in libroar-compat2 1.0~beta11-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/roaraudio/complibs/../../libroaross.so.2