Yes, you can independently have two different keys! Now, they won't both be downstream; one is DSK, the other upstream. The corner bug could be assigned to the camera on the upstream effects bus. If you feed an alpha-enabled graphic into LiveSet Constructor as a foreground element, but choose NONE for the background, then it gets added as a bug in the Scene drop-down list on the Input setup tab. You can then activate that 'effect' and it is completely independent of either VCR still running a scroll, crawl or motion lower-third.
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