4C Meathod

I am running a Friedman Twin Sister using the 4C method. Would like t run in stereo have a synergy power amp for the second channel
How do I split the signs using the the Friedman preamp and the power amp for the second channel
Using out put 3 for the Friedman
Have tied splitting after the QC effects loop to output 4 does not work
Any ideas just want to set a different delay to the other channel (4)
Thanks
Steve
An