Reply to MF3D L.E.D pulse

I've been playing around with my mappings the last few months and on the community s (and google) for the last few weeks and cant find anything.
can anyone tell me or walk me through how to set up my L.E.D's to pulse to the beat of my deck that is playing and/or to set one button to pulse specifically for deck A and one for deck B.
any help is greatly appreciated
thanks