curveccN
The curvecc
modifier, when it's present, designates a ‹curve› which shapes
the controller input. If absent, the default curve is used, a straight line
which runs from 0 to 1.
The value of curvecc
is a positive integer. It is the index of a curve,
either built in or user-defined, which corresponds to the ‹curve›
opcode
curve_index.