ATS is a little software for MacOs I've written as a C++ course project. The app is analizing surrounding sound and renders images moving dynamically. Code is based on OpenFrameworks, a very cool open-source framework for creative projects. The math behind are derived from the Cooley-Tuckey Fast Fourier Transform algorithm written by Sergey Chernenko that you can find here.
It analyses the sound listened by the micro of a computer, gets the spectrum frequency out of it and creates little animations based on those frequencies. It basically proposes four options :