A sensor board, placed behind the display, picks up the signals from the inputs. The only limitation to the number of inputs available is the size of your screen. Inputs are held on magnetically, and have a low friction backing to avoid scratching or gouging your screen.

Here is a demo video showing use with one knob. It doesn’t appear to slip or slide at all while they are turning it. We’d love to play with it a little bit and see what it is like, as well as see more information on what technology is being used.

[via Music Thing]