I don't know any of this for sure, it's educated guesswork, but I "think" the throttle calibration has a rate-of-change function regarding response to pedal input. I do find the behaviour somewhat variable and unpredictable, if you ease the pedal down a little it seems to respond very gradually and to a fairly limited extent (on the basis that you are driving "gently"). If you stab the pedal more rapidly, even if the travel isn't particularly big, it seems to respond to a significantly greater extent (on the basis that you want to get more of a move on).
In other words, in my mind it seems to give more throttle response for the same pedal movement if you move it quickly than if you move it slowly. Now that impression may be wrong, but it's what I perceive.
The trouble with electronically controlled systems (throttle/CVT) is that the algorithms can be anything the engineers want and don't even need to be consistent, it can respond differently depending on any input either steady state or transient, step change or ramp, different temperature, road speed or transmission ratio etc etc. Sometimes just because something can be done it doesn't mean it should. At least with analogue systems the user can know how it responds, a lever is a lever, electrons are more nebulous.
I find the CVT Jazz seems to lull you into a gentle style of driving just because of how it responds, a true "old f@rt's" car. Fortunately I am one.