I frequently want to make an long overlay from two clips (theatre recordings).
I use the upper track the opacy pull down the desired value (mostly about 50%) and the lower track full as you should do.
The only thing is that because of the two layers the picture becomes a bit darker at the period of overlay.
Is there a possibility that you can make such long overlays without going darker, as it goes with titlers.
Next time I will try your suggestion, thanks