The AI voices in knowtion are also from ChatGPT. We did not integrate an additional tool for this.
You can select an AI voice PER PAGE in the page editor. Alternatively, you can choose a voice for the entire project in the general project settings. This voice will then be used on all pages.
Custom text-to-speech content can be used in hotspot pop-ups and in feedback messages for quizzes; this content plays when the pop-up opens.