Andy Grove has created a musical instrument by adding 8 ultrasonic distance sensors to a Raspberry Pi, via an Octasonic breakout board. The software, which is available on GitHub, is written in the Rust programming language and the synthesizer is based on FluidSynth, a piece of software I used myself in my Music Box project.

Take a look below at two videos of it in action. The first just uses piano samples:

whilst the second uses a larger area of instruments: