Digital audio processing is a complex yet fascinating subject. Getting a deeper understanding requires knowledge in multiple technical disciplines, including physics, electrical/electronical engineering, and some software engineering when it comes to parts of the Linux ecosystem. This article aims to demystify the Linux audio stack by explaining the basics of sound, how humans perceive sound, and the workings of digital audio. We will then dive into the components that make up the Linux audio stack and explore how these interact. Buckle up; it’s going to be a long and informative read.