I just tested it with a video of a Greek introductionary language lesson. Quite a lot of those examples actually did not work, as they seemed to have a problem

I just tested it with a video of a Greek introductionary language lesson. Quite a lot of those examples actually did not work, as they seemed to have a problem with the words being spoken intentionally understandable, slower and in a way that while helpful to people not knowing the language, is not natural to the language. But the things not working were actually sometimes really funny and the voice sounded more drunk than I would have imagined.