Hi guys,
… @GiovanniBarbaro… not so far from your Setup (Xone:DB4 – 2x Cdj-2000NX – 2x A&H K2 – Mac Pro Late 13 – Yosemite 10.10.5 – Traktor Pro Scratch 2 ver:2.8.1)
Less is more, i always try to keep it simple …
My two K2 are X-Linked each others (RJ-45) and to the DB4, they don’t need to be aggregated, (as my two Cdj’s they don’t need either). All of them are also going out via USB (HUB 2.0) to my Mac. I’m used to separate the one coming out the DB4 (which contain my soundcard) and plug in directly to my Mac, avoiding all risks of conflicts. (So I will use two slots on my Mac …) One for DB4, one for my HUB (2 K2, 2 CDJ)
For Traktor, to get your K2 functional as you mapped it, you’ll have to disable the X-Link Pairing in your Xone Configuration Menu (on the mixer), and have two different channels
… hope it helps, …
For Stems, the use of a K2 is,in my opinion, without any screen, even with a Led-Out Mapping, a second-choice solution … anyway have to wait a bit more to see if it’s the massive success anounced …