Audio, in the form of voice recordings, musical soundtracks, sound effects, audio description, etc. can be used on its own as a Content Activity when a visual element is not needed. Audio can be used for a variety of purposes including, mastering auditory skills or techniques (i.e. language pronunciation, analysis of musical structure, mathematical computation), sharing interviews with subject matter experts, sharing short lectures, oral histories, etc. When incorporating audio, it is recommended that you avoid overly complex and dense content material that includes lots of facts and figures, use shorter clips to keep students engaged, and make sure that the audio fits with the learning outcomes of the course/module. For more information about using audio, please see Tony Bates article on Seeking the unique pedagogical characteristics of Audio.

You can create audio clips using tools such as Audacity, and Vocaroo.