Mapping was built with this Tutorial:

https://djtechtools.com/2017/05/08/hack-rekordbox-use-controllers-jogwheels/

Set Midi- Channel of Xone 4D to 15

If not shown others right = left

1. Install Rekordbox

               You need a Rekordbox Hardware unlock device or a Rekordbox Abonement

2. Install loopMidi:

               https://www.tobias-erichsen.de/software/loopmidi.html

               create virtual Midi device named PIONEER DDJ-SX 

3. Install Bome Midi Translator Pro

               https://www.bome.com/products/miditranslator

               load XONE4D to DDJ-SX.bmtb

4. Start Rekordbox

               Rekordbox recognize the virtual PIONEER DDJ-SX

               Midi Routing for PIONNEER DDJ-SX is loaded in the SW automatically

               import Midi mapping for XONE4D

               import Midi mapping for PIONEER DDJ-SX from the downloaded directory