You may have noticed small changes to the mp3 players on the languages and exercises pages. I have finally updated all of them to HTML5 so they should work on mobile devices.
I am still adding the players to the language tutorials, but for now all of the tutorials have players on at least the first page.
Let me know if the players are not working for you or if a file does not play. (I’ll need to know which operating system and browser you’re using.)