I have never been able to use Reaktor fx as a effect until last night. I don't what lead me to this confusion but in the main view you can drag effects into Reaktor and that will take you directly to the Reaktor Structure and it's easy to connect up the wires to the outputs. However, the problem is understanding the outputs so if you want to add another device what do you connect it with so that both devices are sounding through left and right? This is a simple thing but if you get this far then everything else is easy unless you can't get a sound from a macro to the output of Reaktor. That may be a question for another time.

Sorry I should have been quicker on the edit. The thing I wanted to say is you can option drag components inside the structure and get more inputs and outputs but at some point if your audio only has outputs 1-2 then you have to combine everything into left and right. That doesn't mean; you want everything to always be in right and left. I've tried combiners before but the outputs never work right.