Audio programming is an exciting intersection between software development, digital signal processing (DSP), and creativity. It's enjoyable and rewarding once you've learned the basics, but how do you get started? In this book, we introduce you to this exciting world with a step-by-step guide to building a synthesizer plug-in. We provide straight-forward explanations to the concepts and keep the math simple. Why build a synthesizer? Building a synth plug-in is a fantastic way to learn and walk through some of the fundamental concepts of audio programming, including: The building blocks of a synth (oscillator, filter, envelope, & LFO) The basics of digital audio and DSP Understanding and handling MIDI communication The fundamentals of real-time audio programming with C++ In this book, we create a follow along using C++ and the JUCE Framework. These are professional tools that are used throughout the industry, and this is one of the only books available on using the JUCE Framework. We provide in-depth explanations on not only the how, but more importantly the why of each step of the process. This is a great resource for developers of all levels, whether you're just starting on your journey or actively working within the industry. Anyone with at least a basic understanding of programming concepts will find this book useful!