Dueling Book Unlock

How do I get the music to work? Also, how can I reset the zoom back to default? I changed it and now everything is messed up XD Also, for some reason the images of some cards that aren't even in my field zone keep flickering as if they were a field spell. Also also, does the atk/def thing no longer support formulas?

Thank you for making this! Makes it much easier when making weirder effects for customs!