1. A system for controlling a user interface comprising:an electronic device, including a display presenting the user interface, programmed to
display a cursor on the user interface
responsive to detection, in an audio signal received by the electronic device, of an upward rake across strings of a string instrument, adjust the location of the cursor in a first direction, and
responsive to detection in the audio signal of a downward rake across the strings of the string instrument, adjust the location of the cursor in a second direction.