Sorry for the late answer but here it comes:

I plug the OT main out to In 3-4
In CueMix I set up Bus 2 with Out Analog 1-2, mute all the ins but the Analog 3-4.
Now What comes from the OT through In 3-4 goes out on Out 1-2 to the FMR RNC.

The out of the RNC goes to In 5-6.
I set up the Bus 8 to go to the Main 1-2.
Mute all the ins but the In 5-6.
Now what comes back from the RNC goes to the Main 1-2.

If I unmute the In 3-4 on bus 8 I even can play with parallel compression. Mix the direct OT signal with the compressed one, set the mix etcetc