Ever found yourself in the situation where you have some kind of home cinema connected to your mainboard soundcard and headphones connected through their specific USB soundcard? It gets tremendously painy to handle if you regularly want to switch from the home cinema to the headphones without really unswitching anything.
I wrote a very basic script that, from two active soundcards, it keeps only one active and switch from one to another each time it is called. Note the script will not handle more than two cards. If you have more, you’ll have to hardcode them with the hash $cards_to_ignore.
Obviously, you can easily add keyboard shorcuts adding a new entry with kmenuedit.