This library requires LChar to work. Also, it's designed to work with Novation Launchpad - a piece of music tech that is usually used to perform in front of a audience or a camera.
It turns Launchpad into HID device - you can run your own apps on it, control desktop apps etc. - whatever your imagination whispers to you. This project is still in progress, but frozen. You can support it by giving a pull request.