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Mechanics and Warnings? - A Question for Friday Night Funkin'.

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So I am a coder, right?

I am wondering how I can add stuff like warnings like in vs bob or ghost twins or Sunday to like say "flash or trigger warning" stuff like that

and I wanna add some mechanics

EX that I wanna add:
background changing mid-song like in terrible fate
etc

NOTE:
I'm using psych engine SOURCE CODE 0.5