To the Audio MP3 file of any DigiVision presentation, just follow these instructions. Frist, navigate to the the DigiVision video you want. While watching, hover your mouse on "Session Info". It's in the top right corner of the current slide. The Session Info window slides out and shows the Resources. The first option is "Right click to download audio mp3". Just right click on it and select to "save the link" (or similar verbiage depending on browser). See the two images below to help you.