Usage:
To list active capture devices - shush.exe list
To toggle mute one of them - shush.exe mute <index-from-list-command>
To toggle mute the default capture device - shush.exe mute 0
To toggle mute either default or other devices - shush.exe lmute 0|1|2|...; ctrl+shift+o is binded to toggle mute and ctrl+shift+u is binded to quitting the application.