Expression box to control opacity other layers

I do a model with several color schemes, and I would like to work back a little:

Generally when I make a model, I have a demo with multiple background layers in it and I'm going to use a Null value in my main computer with an appropriate amount of control of Expression boxes to control the opacity of the respective layers BG - pretty normal stuff.

The downside is that if I want to reuse this background layer in different compositions I have to duplicate and change the expression to match the location of the null whenever it moves.

I would like to work backwards (if possible) and apply an expression to the box itself which refers to a single BG precomp. This way I can copy the null value to my 20 different model comps, while expressions always reference a single demo, allowing just copy me the value null of one model to another without ever having to change expressions.

Is this possible?

If I understand what you're asking, I don't think it will work because an expression affect anything except the property hosting the expression (the box itself, in your case).

Dan

Tags: After Effects

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