Include the tool for recording small tapes in different parts of a document, as in PowerPoint presentations, in which you can listen to a different recording in each slide. Same idea, but adding a sticker, for example, in a specific part of your work which you can be able to listen to while studying with your IPad once you click on it, for instance. The recording tool for the whole document is good, but being able to record just a smaller tape for a specific part of your studying material, would be awesome, too.