In Reaper there should be 4 inputs available to be enabled in the sound preference screen.

In the POD Farm Mixer view you can select what sends 1-2 and 3-4 send to your DAW,  processed, semi-processed, or Dry Input

If you also have the POD Farm plug-in, a typical workflow may be to send both the processed and dry to your DAW and add the plug-in to the dry post processing.