Hello. Please bear with me because I am a beginner to After Effects. I have two video layers that I am fading between. At one point I am using the Colorize portion of the Hue/Saturation effect to cycle through the color spectrum. One layer's colorization starts slightly "delayed" so that when one is colorized to green, the other is colorized to red. The problem I am facing is that I only want this effect to be active for a certain amount of time, and when I change the Colorize Saturation down to 0, the layer has no color for the entire length of the clip. I want to somehow change the opacity of the effect so that it fades in. I cannot use something like a solid color layer because it would affect every layer beneath it, and I need both changing colors independently. I thought about using masks, but I couldn't find a way to add an effect to a mask. Any ideas?
If I understand what you are trying to do I would suggest just pre-composing the two video layers in two separate comps and fading between the comps. One comp would contain the two layers with effects applied and the other without.