Original file from Makezine 33: https://makezine.com/projects/make-33/simple-soundboard/
Startup script source: http://blog.scphillips.com/posts/2013/07/getting-a-python-script-to-run-in-the-background-as-a-service-on-boot/
Setup the Raspberry Pi 3 as a bluetooth speaker: https://raspberrypi.stackexchange.com/questions/47708/setup-raspberry-pi-3-as-bluetooth-speaker or https://www.instructables.com/id/Turn-your-Raspberry-Pi-into-a-Portable-Bluetooth-A/