Monitor single center track in a multi LRC surround track

I have recorded a LRC surround track (3 different signals on 1 track) and want to monitor only the center track.
How is this possible?
With mixconverter V6 it is possible to monitor L+R but no center track :question:
Have tried several routings, and also with the control room but fruitless.
Also a routing from the LRC track to a mono group was unsuccessful.

attached 2 pics

Thank you very much
main window.JPG
VST verbindungen.JPG


does anybody know? or how is it possible to export only the center track or any other of the 3 recorded tracks?

thank you!