Quadrant is an open-hardware, human-computer interface based on an array of distance sensors. The device consists of four time-of-flight sensors and is specifically designed to detect the position, velocity, and orientation of the user’s hand in free space. On-board signal processing is used to recognize gestures and other events, and these values can be mapped to a variety of musical parameters in software as well as hardware synthesizers. Quadrant has USB, CV, and hardware-MIDI outputs, so you can connect it to your computer, your analog synthesizer, or any other compatible equipment.