Best practice for mp3s in ePubs?

Hello, all.
I am wondering if there is an accepted best practice for including mp3s in ePubs?

  1.  Which is best?
     *   Streaming (which requires users to be online)
     *   Packaging the files with the ePub (which greatly increases the file size)
  2.  Is there standard code for default players for mp3s in ePubs?
     *   For a short player for tiny clips which would only have a single play/pause button.
     *   Different code for a more complex player for longer audio which might also have ff, rewind, scrubbing, etc.
  3.  If not, are there particular controls that need to be included or avoided?
  4.  Either way, if there are multiple audio files on the same page (or in the ePub as a whole) is there a best practice for identifying each distinctly (primarily to support voice control users being able to easily indicate which audio they want to play).
  5.  Are there any other best practice considerations about including mp3s in ePubs?
     *   (Besides the fact that there should be a text version of the content unless the entire point of an audio is to test someone's ability to interpret the audio.)
Thank you ever so much!
-Laura

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Laura Ciporen, CPACC
Digital Content Accessibility Manager
McGraw-Hill | Higher Education
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