A new digital music interface replaces the computer keyboard. “The computer interface is an adjustable, hollow device affixed to four thin metal tubes divided by a bridge into long and short sections. By positioning the fingers on the long section, a player can control pitch; by positioning the other hand’s fingers on the short section, the player can control such things as tempo and volume. Four laser pointers shining down the length of each rod relay the plucking motion to a tiny Web camera located on the bridge. When the player presses on the rods, the finger splits the beam of light, reflecting a splotch of light back to the camera.”