You might want to have a rumble pack in the controller for this to work.
There should be a message scrolling across the VMU's screen...
There should be music playing on this page.
I'm not sure whether the audio tag works. The MP3 is under 6mb, which is one of the requirements for this.
I do have the audio tag down there, just to see if it shows up. It'll play the same MP3 as the one that should be playing right now. If I find out it works then I'll take away the autoplaying tag.