The Arturia KeyLab mkII is a "bridge" tool to make these MIDI controller keyboards (KeyLab mkII 49, KeyLab mkII 61 or KeyLab mkII 88) compatible with Renoise.
In general, it enables all the extra buttons of the controller and converts the wheels and faders into dedicated controls for direct editing in the pattern editor and for navigation.
Activate the tool and go. The learning mode of MIDI mapping is not necessary! Turn this controller into something useful!!!