Reply to 2 xone k2's (n00bish Midi clock sync question)

Alright guys... there might be a very simple answer to this question but its busting my balls!!! I have only used controllers in the past and haven't had any encounters like this until just now.

So I picked up a xone k2. My buddy and I dj together and decided we are going to set up with two of these and an external mixer.

WHY AM I ONLY ABLE TO SYNC WITH MIDI CLOCK??? IS IT THE ONLY POSSIBLE WAY? I have never encountered this problem.... It's not that big of an issue... but it'll be pretty annoying in the long run. I just got rid of my s2 and played out with it all the time and it was perfect. I know the K2 isn't supposed to be the easy plug and play controller but I wasn't expecting it to mess with my layout and all that. I am ready to conquer this and I hope you guys are easy on me... One other thing I noticed when I initially plugged in the k2 was it immediately changed my layout options. I used to have four options something along the lines of MIXER, EXTENDED, BROWSER, and something else I can't believe of at the moment. Now I only have MA CLOCK+REC/MA EFFECTS. As well as the generic layout options from the layout manager in preferences. PLEASE HELP A /b/rother OUT!! thanks