In first slide, end user has to select the language they want to view the course. In second slide, I have created two layers and added audio in each layer for two languages. In this case, end user cannot have control on the seek-bar where all my objects are synchronized to audio. It will work when seek-bar access is not available to end user. But I want the end user to control the seek-bar. However, I also do not want to create separate slides for each language inside single course as it consumes double space. How is this possible?