You can create your own velocity curve by editing the user-definable curve.
Procedure
Activate the topmost button to the right of the velocity curve editor.
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In the velocity curve editor, double-click to add curve points.
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Click and drag each curve point to the desired position.
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To delete a curve point, double-click on it.
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Drag the curvature up and down for a more inward or outward bent curve.
Drag the curvature up for a harder sound of the piano 
Drag the curvature down for a softer sound of the piano NoteThe nodes in the bottom left and top right corners can only be moved up and down.