Check in the setting, under scripts there are scripts to run on detection of each of the glyphs.

So basically, if it detects Glyph 1 it will run the script set in settings for Glyph 1. This script can be anything.

In your case, I assume it would just need to be;

MP3TriggerPlayTrack(D0,38400, 1)

or

PlayAudio(1.mp3)

And you found that before I finished replying... it's here for future users to find though :).

Thanks Rich

I didn't really see anything on the Glyphs in the manual but looked closer at the QR codes and put 2 and 2 together and there it was :)