well I'm not sure.. but I think I get what you are saying. But just to let you know .. the Multiply option is only so its see through that's about it. so for example the bottom layer (layer 0) is on normal and it is green, the second layer(layer 1) is on multiply but its color is blue. Nothing happens.. much. but if you have layer 3 on multiply ALSO with the color blue again. its starts getting trippy.
Because like I said. Multiply layer is only so you can trace or stuff.. Or create pretty colors.
But I'm not sure what the problem you are having since you only said its "trippy" and didn't give an detail explanation of "trippy"