Mura has a user interface element for embedding audio code in your mobile learning. Consider creating your audio in an audio creation tool, uploading that audio to a free streaming server, like SoundCloud, and embedding a link to the player for that audio.
This mobile learning site has been made with Mura and the mLearn Bundle that can be downloaded at mobile-elearn.com.
This mobile learning technology was originally introduced at mLearnCon 2013 in San Jose, California. To check out more learning technologies and instructional design tips, review the work of Jim Hicks at professionCube.com