https://www.theverge.com/2018/7/29/17623118/oddball-drum-machine-midi-controller-kickstarter

A Kickstarter project called Oddball aims to put a new spin on making music. Comprised of a ball about the size of a lacrosse ball and an accompanying app, the ball behaves as a percussion trigger, making noise whenever it’s bounced off a surface.

The idea with Oddball is that a sound can be assigned to it, and then that sound is played whenever the ball is bounced. Sensors inside the ball communicate with the app via Bluetooth, and then the sound plays through your phone speakers, headphones, or wherever else you assign it. The ball is pressure sensitive, meaning the harder you bounce it, the more “intense” the sound is. The Kickstarter page doesn’t define what “intense” means here, but the assumption would be harder = louder.