Hi Thanks Trax, but what I'm looking to do is actually conduct BIAB live and have some post processing through Reaper.

I have some "Waves" plugins, they don't work in BIAB probably because Waves wraps them in some fancy shell. They work fine in Reaper.

I can take an external audio cable and loop it out one audio and in another.
I was hoping to do it through ReaRoute because it's clean and fast.