The Mackie have nothing to do with this. The Mackie is for DAW functions not Keyboard functions.
The settings i ask for is inside the keyboard setup, and can't be seen in your images.
Have you used the "New Keyboard" setup in Studio One to set up your Keylab MKII and named it Keylab61 yourself? Keylab and Keylab MKII is not the same.
(In Studio One 3 that i have there is'nt any Arturia controllers on the list. But perhaps the old Arturia Keylab is on the list in Studio One 4.)
I attach a Setup window from Studio One 3. Note the filter section. Unless this has changed in Studio One 4, then leave the boxes unchecked. If you have checked them, then you filter out the functions so they can't be used.
I assume you have'nt mapped your controllers Pedal, Modwheel and pitchbend for Control Link. If you have, then please tell.