Sorry, my mistake. As you are using a baseURL, your audioURL should be relative to the baseURL rather than to the page containing your gallery's embedding code.
audioURL="galleryFiles/WeddingGallery/01 - Better Together.mp3"
audioURL="01 - Better Together.mp3"
... and your audio track should then play OK.
There are 2 html files -- does that matter? -- the one the simple viewer creates (index.html) and the one I created (gallery_weddings.html).
The gallery's own 'index.html' file is required only if you want to display the gallery on a page of its own (or if you want to embed the gallery in another web page using an iframe). Otherwise, this file is not required and can safely be ignored.
SimpleViewer Support Team.