As Leap Motion dev units have begun shipping out, developers have been toying with the motion-tracking device to find unique uses for it. One developer in particular ended up using his unit to help him out with his music recording. Stephane Bersot used the Leap Motion to play air drums, change the pitch of his guitar, and even control the EQ on his piano keyboard.
Essentially, the Leap Motion is able to change the pitch of the guitar chords based on the position of the guitar's headstock, meaning that there's no need for players to use a tremolo bar or bend the strings while playing. The device can also track specially-made drum sticks that allow the Leap to track the end points of the sticks to play the beats.
However, that seemed to be Bersot's most difficult challenge. He says "it wasn't easy to play drums with it," and it actually needs more work to make it more stable. Essentially, Bersot used the velocities and positions of the drum sticks on the X axis, and had it play the note at just the right time during the down motion.
We're assuming Bersot's project is just for fun, since it doesn't seem like he plans to release something like it anytime soon, but it goes to show the potential of the Leap Motion device. While it can be used to track your hands to move objects on a screen, the implications of such a device go way beyond what one might think.