Yes, you can get the audio by expanding the presentation. Here are the steps:
- Make a copy of the presentation to a new folder.
- Change the file ending from .pptx to .zip. Choose Yes when Windows warns you about changing the file ending.
- Expand the file.
- Open the ppt folder, then the media folder inside that.
- The audio files are in there, though they have been renamed from their original file names.