Vir2 Instruments Acoustic Legends HD - Manual (Page 46)

A c o u s t i c L e g e n d s H D . . . . . . . . . . . . . . . . . . 4 6
When in MIDI CC mode, move the MIDI device’s control that you
want to use for parameter control in Kontakt Player 2. A “lightning
bolt” will light in red to the left of the corresponding CC number in the
browser. Click on the CC number and drag it on top of the
parameter you want to control. A hand will appear if the assignment
is allowed. Release the mouse, and the assignment is made.