Help with Music Change?

I'm using FF3usME the latest version, and I'm having trouble. I already made my boss, stats, scripting, etc, but I'm having trouble changing the music. I see a section called Monster/Formation editor that I can change the music, so I decided to change it to boss music, or Decisive Battle. Whenever I encounter the boss I created, it just plays the Battle Theme, any help?

Which monster formation # is it, and what is the circumstance of the battle? Is it a random battle you have set up into a monster pack somewhere? Are you sure your doing it for the right formation?? It -should- work. You got the music flag checked and its set at boss theme, and you save? When you close/reopen the editor is it saved at the boss music still? Sounds to me like you are setting it to the wrong formation, or calling the wrong formation for the battle. That, or its not saving. Double check both 100% please, and come back to me. =)