/usr/lib/x86_64-linux-gnu/libgrooveloudness.so is in libgrooveloudness-dev 4.3.0-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgrooveloudness.so.4
/usr/lib/x86_64-linux-gnu/libgrooveloudness.so.4