You could try setting the Gearbox standalone audio driver to Rearoute asio (you may not have it installed, it needs to be checked when you install Reaper).
Then you just set a track in Reaper to record armed, input = Rearoute 1+2...it should work in theory (I probably have the standalone too, I will try and check that). I dont know how you are routing it now, it must be a soundcard default or something.
Pod Farm 2 is definitely worth getting btw.