/usr/share/doc/libsndobj-dev/examples/ is in libsndobj-dev 2.6.6.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libsndobj-dev/examples/Ladspaplug.cpp
/usr/share/doc/libsndobj-dev/examples/Ladspaplug.h
/usr/share/doc/libsndobj-dev/examples/blurring.cpp
/usr/share/doc/libsndobj-dev/examples/cvoc.cpp.gz
/usr/share/doc/libsndobj-dev/examples/cvoc.txt
/usr/share/doc/libsndobj-dev/examples/denoiser.cpp
/usr/share/doc/libsndobj-dev/examples/example1.cpp
/usr/share/doc/libsndobj-dev/examples/example2.cpp
/usr/share/doc/libsndobj-dev/examples/example3.cpp
/usr/share/doc/libsndobj-dev/examples/extract.cpp
/usr/share/doc/libsndobj-dev/examples/fir.cpp
/usr/share/doc/libsndobj-dev/examples/harmonise.cpp
/usr/share/doc/libsndobj-dev/examples/jack_schroeder.cpp
/usr/share/doc/libsndobj-dev/examples/jack_streson.cpp
/usr/share/doc/libsndobj-dev/examples/ladspa_example.cpp.gz
/usr/share/doc/libsndobj-dev/examples/midisynth.cpp.gz
/usr/share/doc/libsndobj-dev/examples/morph_tilde.cpp
/usr/share/doc/libsndobj-dev/examples/pluck.cpp
/usr/share/doc/libsndobj-dev/examples/rtschroeder.cpp
/usr/share/doc/libsndobj-dev/examples/schroeder.cpp
/usr/share/doc/libsndobj-dev/examples/sinus.cpp
/usr/share/doc/libsndobj-dev/examples/streson.cpp
/usr/share/doc/libsndobj-dev/examples/test.cpp
/usr/share/doc/libsndobj-dev/examples/transpose.cpp