1) The global way: Go to Global, then raise the Velocity Curve to 8. This will make the touch sensitivity/velocity sensitivity go away
2) Per PROGRAM [NOT COMBI] editing.You need to open the program, MENU->AMP, then set the Velocity Intensity to 0 in both the first and the 2nd tab.
Obviously any COMBI using this will change as well.
Hope this helps someone

Edit: I'm referring to a way that works specifically for each comb/prog [found the global curve one ] But for separate combis when I bring up the menu, there's no AMP option where I can edit the curve.
Many apologies if this has been answered, could only find this answered on these forums for the M50.
I play a lot of synth strings that I just need a constant steady volume for no matter how hard I hit the keys. I fiddled around and found the VELZ option that let me set top and bottom velocities but that does exactly the opposite of what I need.
Thanks again,
Paul