Async Loading Screen

Hi, I am planning on using this in our game, its a great plugin, thank you for making it. Im not sure if you would have a solution to this without modifying source code, but, i was curious if you know the best way to play music during the loadin screen without it being in the movie itself? We are using Wwise and I have yet to find a way, I figured playing it through the game instance would allow it to play along side the loading screen, but it seems i will need a different method to play it asynchronously, if you have any tips that would be awesome!