Here is how you adjust the keyboard velocity curve on the MS60.
Depress "Edit" button, then F1 (Midi), then F5 (Utilities), then F2 (Velocity Curve), then using the "value" keys (+ or -) , you can set the velocity curve value at 1,2,3 or 4. Setting 1 has the most response to key velocity, setting 4 the least.
Hope this helps.
Paul C.