Please make sure you are familiar with Introduction to Web Audio API and Sampling Theory before starting this topic.
This topic will show you how to use Web Audio API to interact with audio files via a web page. The first lesson illustrates a number of different ways you can load and play a sound file. The second lesson walks you through a more sophisticated process of building a granulator application. The third lesson shows you how to use an microphone—like the one in your laptop—in order to record audio and have it interact with a larger web application.