You can access the student’s audio material for selected books free of charge with Otso application. You can download the Otso application from Play store/ App store. Once you have downloaded the app, you can search the book and add it to you library. The application asks for permission to use the camera whilst using the app, but only when you search for the specific page, which is marked to include audio/video material.
If you have an iPhone, please make sure your phone isn’t in ”silent mode” when you are using the app, otherwise you can’t hear the audio.