1. can i change the output panel layout on request?
I think, TVS' multiviewer is meant. No, it con not be changed (see threat
Arrange Multi-view Display TVS)
2. If I show a lower third for sports , can i use an external source to show some data live?
What is external ? You can use the two media player to playback graphics from media pool (At TVS 20 still pictures).
You can use up to 5 devices conrolling the TVS. So a graphics operator can prepare the graphics on an additional computer, including upload to the TVS and set to one media player.
When you want to insert graphics form onother (video-)source, cou can connet it to an normal input und insert them via chromakey.
There is an powerful macro system, so you can automate some things. (e.g. the setup settings for the chromakey, combined with the cut to the source)
http://www.vis-ranger.com/ATEM/It is discussed in
http://www.atemuser.com/forums/atem-vis ... tem-macros