It's a controller for Frets on Fire an open source version of Guitar Hero. Katie and I have gotten kind of addicted to it, so I decided to make a real controller for it. It's made from a lot of scrap pine, some pieces of steel and aluminum that I had lying around, and the control PCB from an old PS/2 keyboard. The game requires the F1, F2, F3, F4, F5, right Shift, and Return keys, so I mapped out the F-keys on the neck, and the right Shift and Return (alt pick and pick, respectively) to two switches in the body. I'm working on the second generation of buttons, made from the same lighted membrane switches as those on the Monome.