Using an KORG KAOSSILATOR PRO with cdj rx, any other controllers, effects unts compatible

Hi. just been looking at a  KORG KAOSSILATOR PRO. I see on youtube someone has set one up so his cdj connects to the korg and the korg connects to the mixer, so he can play a track on that cdj drop in what is on the korg and still have his next tune ready on the other deck.I see that i could plug the korg straight into the rx but that be taking up one channel. Is it possible to connect up how i explained, i'm assuming not, here the video btw

https://www.youtube.com/watch?v=laMNdZh-EDc

Are there any other toys, like this, or a controller or effects unit that work well with the rx

thanks, hope that makes sense