[Cin] Multiple viewers (like mixer, but without it)

[Stefan de Konink]

I have multiple video tracks. I would like to play them simultaniously. Is 
it possible to assign a viewer to a track, without going through the mixer 
step initially? Preferably I am looking for an output that does take in 
account the applied plugin, but does not do downward compositing (or the 
latter should be configurable).

This is the documentation for the multi cam mixer;

<https://cinelerra-gg.org/download/CinelerraGG_Manual/Multi_Camera_Mixer.html>

It is mentioned "Using the track patchbay, mark the new tracks as mixer 
source to be added to the viewer." I fail to see how I could mark it (or if 
this is the correct approach).

-- 
Stefan