That helps plenty,thanks so much for taking the time to respond.
I should have been clearer: I’m not trying to split the channels from my XDJ-RX, just one or a ‘master’ per se from it will suffice.
If I’ve understood correctly, an RCA cable from the XDJ-RX master out to the input of channel 2 or 3 on my DJM750 will accomplish what I’m trying to do? Thanks for the clarification.