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Finally, we need to add Tone.Context.Resume() after the user pushes the button, but before we start initializing our variables to fix a bug that otherwise pops up in some cases (full details here if you’re curious https://github.com/Tonejs/Tone.js/issues/341). Our code should now look like this, and when clicking the “Say” button, you should get a prompt to allow the browser to access the microphone (or see a “recording” indicator if you’ve already allowed access).
Tone.js is a JavaScript framework that adds a layer of abstraction to the Web Audio API that’s included natively in the browser. While we could work directly with the Web Audio API to set up our recording and playback functionality, Tone.js makes achieving those things a little bit easier.