SOS was developed with Hans Wilmers at NOTAM (Norwegian Center for Technology in Music and the Arts) from September – October of 2010 with support from the American Scandinavian Foundation creative arts grant. SOS consists of six pressure sensitive sensors affixed to the main keys of the saxophone paired with a microcontroller strapped to the bell of the saxophone that wirelessly tracks motion, acceleration and direction in three-dimensional space. It is specifically designed to adapt and be transfered to any member of the saxophone family in a matter of minutes.