Behringer Xenyx 1002b mixer

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I've kept it for years even though I replaced it with a Mackie DFX6. Channel one just started acting up so I might as well just toss it.
 
I just purchased a 1202FX, though I am not sure how I should run it in my setup.
Usually Controller/mixer output into a stereo input of a live sound type mixer is typical. All mics connected to the live sound mixer (in your case the Behry) except maybe 1 for your use into the controller (Numark).
 
I've done it with the small mixer going into the DJ mixer before using the tape out into a stereo channel on the DJ board. I did it the other way around with my Mackie mixer once and blew that channel out for some reason. I don't know how it happened but it's not good when you smell something burning up! Have to be careful with the gain structure.