Command line
The unsound command is inside the app. Use its absolute path:
/Applications/Unsound.app/Contents/Helpers/unsound status/Applications/Unsound.app/Contents/Helpers/unsound vol Music 40/Applications/Unsound.app/Contents/Helpers/unsound mute SafariTo type unsound instead, link it onto your PATH:
ln -s /Applications/Unsound.app/Contents/Helpers/unsound ~/.local/bin/unsoundRun unsound help for every command.