Audion is a Chrome extension developed by the Chrome Web Audio team. It is a free tool that adds a Web Audio panel to Chrome Developer Tools, allowing users to visualize the web audio graph in real-time.

To use Audion, simply install the extension from the Chrome Web Store and open Chrome Developer Tools. You will find a new "Web Audio" panel at the top. Select the panel and then visit or reload a page that uses the Web Audio API. If the page was loaded before opening Developer Tools, a reload is required for the extension to work correctly.

Once you have the Web Audio panel open, you can pan and zoom using your mouse and wheel. There is also an "autofit" button that allows you to fit the graph within the panel.