You have both Text Source and Title Source set to go to the same "Main Text" object. So Main Text is getting over-written by the Title.Hi DC
Tried it today, but I guess I am doing something wrong.
I created the alternate text source in my scene, but that displayed the "Song Title"
I was unable to make the main text appear in the correct box
I attach two screen captures so you can see what I had set up and where I have gone wrong.
Otherwise it looks good