In case the midi keyboard or the software / USB interface flips out on you and you cannot assign more than one controller (or if it is always mapped to CC00) do this:
- turn off the midi keyboard
- hold button 1 and 4 below controller A and D while turning on the keyboard. This will reset the settings.
- restart Reason and the auto-detect feature should find the MIDI signal from the controller. In case it does not react to MIDI signals, assign the controllers to the following channel numbers:
A -> Expression
B -> CC12
C -> CC91
D -> CC93
Pitch Bend = Pitch Bend
Mod Wheel = Mod Wheel