VKB-SIM

Maybe I'm stupid, but how does one program axis 9 (controller 2 axis 1) to activate a button if the Axes2Buttons tab only goes to 8? You can also not set a curve for anything past axis 8. Why is there no scroll bar on the Axes2Button and Response Curve tabs on the profile page?

As a workaround I swapped axis 7 (controller 1 axis 7) and axis 9 (controller 2 axis 1) on the global page external devices tab.

Restrictions of Microsoft direct input. 8 axes per device. Your solution is right. NG firmware series allows to use extra axes of virtual controllers directly.