The Sinetactophone is a two-player collaborative instrument, and an exploration in expressive gesture. It mixes theremin-style motion control with the satisfying, discrete feel of physical buttons.

It uses an Arduino-driven time-of-flight sensor system that is mapped into Ableton to handle the sound design. The interaction model allows two people to control separate audio channels, creating emergent harmonies when users coordinate their movements.

Through multiple iterations, the instrument's enclosure geometry, sensor placement, and visual feedback were refined to make it more intuitive. Audio-reactive LEDs were added to provide clear visual cues, helping players understand their impact on the sound.