If you have the option to publish locally, you can absolutely
get the audio files in mp3 format. After you publish a
presentation, go to the folder or directory you published to, and
look for a folder titled "data". Inside the data folder you should
see a series of mp3 files that you can easily use for other
purposes...like podcasts, or you can convert the mp3s into .wav
files if you have audio software like Audition or Audacity.