I'm using GM 1.4 and I'd like to know if there's some cool way to change backgrounds by index without having them added in the room, because I'm trying to work with more than 8 backgrounds (which is how many one can add to the room) and my intention is to keep the same room for those backgrounds. My game changes the backgrounds by checking a condition and if so by setting background_index to another background index (not added to the room) but the change is instant. I'd like to make it smooth. Any tip or tutorial to share? Thanks in advance.