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The sonic pi [https://www.cl.cam.ac.uk/projects/raspberrypi/sonicpi/ Sonic Pi] is a an open source programming environment that allows you to make sounds. It is a way to build a synthesizer from scratch. The teaching and learning materials are open and free. [The Sonic Pi] has been in the works since 2012 and was created by Dr. Sam Aaron: a musician and researcher at the University of Cambridge.