Thank you. These three articles were just what I was looking for.

"Metta (www.metta.io) is a digital storytelling tool that allows you to create lessons using audio, videos, and images from your computer or from the web. It is a great online app for creating short flipped or blended lessons for students to help them learn outside of the classroom. With this outstanding web application, teachers can easily create a digital content based story, supplemented with images and text. Teachers can also include poll questions in order to test the knowledge of students. So, with Metta, you can easily combine multimedia elements together to produce an awesome digital lesson." (Source: http://www.emergingedtech.com/2013/10/create-digital-learning-content-easily-combining-parts-one-more-videos-with-images-text-audio-using-metta/)