DESCRIPTION: piezo disc contact microphones are the key to making new and unusual sounds with my Springboard: http://ericleonardson.org/instruments/ Here you can see and hear how piezo disc contact mics amplify vibrations of all kinds of readily available materials and objects in this 2007 video by Gretchen Hasse, media producer for Gearwire. My bowed wood sounds are very similar to sounds from Hans Reichel's amazing daxophone: http://daxo.de