Reply to Basic mapping and USB questions

Hello DJTT, this is my first post, so Im saying hello here! I'm not one for intros, but this post will pretty much explain where Im at.

I bought a Mixtrack Pro when I first got into DJing, and I found it to be pretty limiting quickly after I'd gotten used to it, especially VDJ. But I liked this hobby enough, so I eventually upgraded to a DN MC-6000 and Traktor Pro 2... which leaves me with a spare Mixtrack Pro to play around with.

The plan was this; to use the mc6000 as my main mixer and keep all the functions for that piece of gear intact in the original TSI file, and completely re-map every knob and button on the Mixtrack Pro for effects and other stuff.

1. How should I route my In and Out Ports for my controller mappings? Currently the mc6000 is set to All Ports for In and Out, and the only other devices right now are the "Pro 2" that is set to Keyboard In only with no Output, and the "Generic Midi" device for my Mixtrack, which is set to "mixtrack pro" for both In and Out Ports.

I noticed the Mixtrack doesnt work at all if you start Traktor and its the only controller plugged in, Im believeing it has something to do with my port settings...

2. Is there an official DJTT recommended USB hub? And if I use a USB hub to add more controllers, will it effect latency?

Thanks for reading this far!, looking forward to lurking here :P