Audio - User Select On/Off

Sounds pretty easy to me. I just did this for one client using the 2008 suite. We used WMA files. Dropped them on the page. Right clicked and selected edit.Used the audio editor to insert events (markers in the audio) when I wanted things to happen. Saved and closed the audio editorBack in Lectora, opened properties and on the Events tab, set actions to show what I wanted to show. If you have more than one thing you need to happen, put the actions in a group and run that group from the event. In your case I would just make all the text boxes white, put them in reverse order on the page so each time you show the next one it covers up the previous one.