The two keys
The right Option key reads whatever you have selected, in any app, with the spoken word lit as it goes. The right Command key is kept for Talk, which is being built now.
- Select text anywhere on your Mac.
- Tap the right Option key once; Chippy's panel appears and starts reading, with the spoken word lit.
- Tap it with nothing selected and the panel says so, with no speech.
Filmed on the site's own build from the story that tests it; a change to the site reruns the story and recuts the film.