It certainly is. An X1 is plenty to control cue points and sample slots.
you may need to use it in nhl mode for the sample slots and in Midi mode for the cue points just so you have full control unless you wanna fanny about with shift functions and modifiers.
Karlos Santos, or Photojojo (Since you’re both awesome by response and knowledge),
Setting up an X1 next to the S4 for use of a sample controller would be awesome! Would that, however, disable me from using the third and fourth decks as track decks? And if so, does it work the same way if I were to use the X1 as a cuepoint controller instead of a sample controller?