CDJ400 SETUP WITH RB4 & SP1

I have ddj-sx one setup, and i have cdj400 with mixer is the Sp1 will control Rb4 : roll, hot cue, effects, slice like in serato?
Or it will be Rp1 for Rb4?
How can i plug the audio sound of the sampler line to a Independent channel in the mixer another sound card?