Here's what I mean. First you insert the "left video file" onto the video track, then you insert the "right video file" onto the overlay track, then you adjust the position of the right video file in the preview window so it is 50-50 with the left video file that is on the video track. Problem is when the video track's "Crossfade" transitions kick in, only the left half of the split screen goes thru the transition, while at the same time the right half video (because it's on the overlay track) just suddenly appears (obviously I have set both tracks to start at the same timecode).
So I thought, OK, select the "fade-in" and "fade-out" buttons on the Overlay Mode's Attribute tab, to fade-in and fade-out the right half video, so as to somewhat "simulate" a crossfade transition to coincide with the left half video's real crossfade transitions. This seemed to look more smooth and presentable; however, during the transition, you can now see the "overlap" footage of the left video file where the right video file is overlapping the left video file.
Is there a good method for making a "Split Screen" video effect work and look seamless at the transition points between other video clips? Is there a better transition to use instead of the crossfade? Both of my left and right clips are the same duration in length and they both begin at the same timecode.
Any suggestions would be very helpful.

