Monitor single center track in a multi LRC surround track

Hi
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
cheers
Bert
main window.JPG
VST verbindungen.JPG

BUMP

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

thank you!