On Sat, Apr 10, 2021 at 08:42:10AM +0000, Rodolfo Medina wrote:
  Now I wish to be sure Behringer UMC404HD will allow me
to do that before I
 purchase it.  It is claimed to have 4 outputs, but its output system looks
 quite complicated: on the back of the device it shows `PLAYBACK OUTPUTS': two
 white, two red and four black outputs.  Further on the right, one more couple
 of black entries, L and R, and then MAIN OUT.  How could I use all those to
 achieve what I'm looking for? 
Just use the four in the center, either the RCA connectors (red/white) or the
TRS (black). It's just two types of connector, they have the same signals.
You don't need the others.
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FA