Before you can use the “unassigned” ones to sound output, you have to route them in the internal mixer of Kontakt:
1. make the mixer visible
2. add channel
3. “make default” (before the new channel can be routed correctly, you have to reload kontakt)
4. reload the instance of kontakt
5. with the “Conf.” tab at the button of the channel strip you can assign the outputs, you like to use…
In this way you should be able to use all the outs of kontakt…last time I tried, was with kontakt 3…I don´t know, if something has changed since then…
Trancit