Question / Help OBS microphone question

I do a facebook live show, up until recently I used my Iphone as it picked up the music I was playing as well as my voice. Now that I graduated to OBS I have a 3 camera system, text graphics and my show is great. But now I need to use my microphone on my music controller to narrate or speak so when I record the entire show off the output of the controller it plays back the music and the microphone. Is there a way using OBS to have the microphone output pick up my voice WITHOUT recording it to the output of the controller?

Any help?
 
Ah I see but it's a bit more complicated then that, the output of the DJ controller goes right to an mixing board and that signal gets recorded but with the microphone being used from the controller I see no way of separating. When I was doing streams off my phone the phone was broadcasting me speaking on top of the music so both were broadcasted with less than good audio for the stream but the output of the controller was being recorded separate so you did not hear me speaking. So it's a matter of splitting the mic signal so you can hear it on the main stream as I need that recorded ( controller output ) I was thinking of using the mic of one of the cameras but I would still need to duck the music off the main stream so when i speak the camera mic pics up my voice only without the main stream follow? As I wrote it's complicated.
 
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