Thanks so far everyone but I dont think this solves my problem.
I am not able to get access to the Mac at the moment but here is the mixlayout that I need.
The problem is that whenever i fade out Layer 2 which is attached to mix 2 then the area remains black. What I want is for the area that is normally Mix 2 to show Mix 1 content that is attached to Layer one.
Does this make any clearer sense?
Thanks
Lee