There is an app, Note Everything, which allows text, voice and paint(hand written) notes. The voice note is in 3gp format (Quick Time plays it) after you save the recording by selecting use this file a box opens with the option to add text, insert date and time among others. Then you can select send and email opens with the file attached. You can attach the assignment file now and send both at once. Since this app runs on the LCD side you can mark up the assignment at the same time. Hope this is useful.