The Emonator is a new musical instrument for amateurs and professionals alike. It gives users a three-dimensional tactile interface to control music using their hands, and can be used as either a stand-alone gestural input device or in conjunction with a traditional musical keyboard or microphone. The Emonator generates audio output by mapping the perfomer's expressive gestures to different musical parameters. The sculptable surface of the Emonator can control a variety of sonic parameters, ranging from the audible harmonics of an additive synthesis engine to the activity level of algorithmically generated music.