Ableton Forum

I'm an old school DJ too. I used vinyl but started in 1995 with the Pioneer CDJ-500.
Have been using Traktor for 3 years on the road and I use Ableton since version 6 now.

The main reason for moving from Traktor to Ableton was the beatgrid for "old or vinyl" songs.
Ableton was and still is the best ...

My set up during Gigs is build in a flightcase. Which was originally set-up for something else (Xone 3D w/o APC-40)
I use in addition 24" Samsung screen (mainscreen for Ableton) and I Use my MacBP screen for itunes.
In the middle below the big screen I have the mixer; (but I prefer to have the APC ...

I sold my A&H Xone 3D after I received my APC-40.
My current set-up: Pioneer DJM-600, Giga-port HD 4 channel stereo soundcard, APC-40 and macbook Pro.

As some others I prefer a regular mixer next to the APC-40
As to your question:
In my opinion The Xone 4D would overlap with the APC-40 on midi ...