/usr/lib/ is in amsynth 1.6.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/dssi/
/usr/lib/x86_64-linux-gnu/dssi/amsynth_dssi/
/usr/lib/x86_64-linux-gnu/dssi/amsynth_dssi/amsynth_dssi_gtk
/usr/lib/x86_64-linux-gnu/dssi/amsynth_dssi.so
/usr/lib/x86_64-linux-gnu/lv2/
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank01.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank02.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank03.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank04.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank05.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank06.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank07.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank08.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank09.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank10.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank11.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank12.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank13.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank14.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank15.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank16.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank17.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank18.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/BriansBank19.amSynth.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/amsynth.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/amsynth_factory.bank.ttl
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/amsynth_lv2.so
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/amsynth_lv2_gtk.so
/usr/lib/x86_64-linux-gnu/lv2/amsynth.lv2/manifest.ttl
/usr/lib/x86_64-linux-gnu/vst/
/usr/lib/x86_64-linux-gnu/vst/amsynth_vst.so