Many (longer) pages are also available as spoken audio. The audio which was created using a Text-To-Speech (TTS) system.

keyboard shortcuts

key action
0 to 9 Seek from 0 to 90% respectively
space Toggle playback
Seek backward by the `seekTime` option
Seek forward by the `seekTime` option
Increase volume
Decrease volume
m Toggle mute
f Toggle fullscreen
c Toggle captions


  • polish text-conversion for speech (most important!)
  • word-level click navigation (in progress)
    • autoscroll when audio plays (as an user option)
    • improve text-alignment (automatically and/or manually via a timing editor tool)
  • timeline markers for chapters (*)