I just downloaded the allvideos plugin and can't figure out how to get an audio file to embed rather than a video.  After embedding the code for an mp4 file, I continue to see the video player rather than the audio.  Not sure what to do.

Did you read AllVideos documentation?

I did, indeed, read the documentation.  In fact, I read it several times.  The video screen appears but not the audio.  Perhaps the documentation should be clearer. How do you make only the audio visible?  The documentation is unclear.