/usr/share/applications/echomixer.desktop is in alsa-tools-gui 1.0.27-2ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | [Desktop Entry]
Type=Application
Name=Echomixer
GenericName=
Comment=Control Echoaudio soundcards
Icon=alsa-tools
Exec=echomixer
Terminal=false
Categories=AudioVideo;Audio;
|