I have an M-Audio Keystation Pro 88. It has 17 Midi assignable buttons (cc44 thru cc60) as well as lots of sliders and knobs. For some reason I have noticed that in all of the Arturia V instruments, nothing happens when I attempt to assign any of the buttons to any of the button controls (toggle or otherwise) to any of the instruments. (The knobs and sliders work as expected). I've bee trying to research why hardware MIDI buttons are not assignable, but I'm not finding much about why ... or how to affect a work around. Can anyone explain what the problem is?... and if there is a way to resolve it?