Demonstration of using AudioWorklets to read from the mic and echo it
back. As of 2020-05 this depends on an API that is implemented in
Firefox 76 and the Blink-based browsers: Chrome, Edge, Brave, and
Headphones are recommended, to avoid feedback. If it makes annoying
noises, refresh the page to make it stop.
When ready, press any key. You'll need to give it permission to read
from your microphone.