I was using my notebook with touch screen of 15.6", 1366 x 768.
I do not know what a "velocity cursor" is.
I feel that moving along the synth path with touch is not smooth. Moving my finger a "millimeter" results in quite a move in the synth. So, trying to move along the synth path slowly is a "burden". Having gone over Nate's comment here, I get the impression that it is related, but may not be exactly the same.
Maybe this is something like the acceleration option of the mouse. With moving slowly, one can be very precise in the movement and when the acceleration option is on, then moving faster the move is accelerated.
With touch moving the synth, I could not be slow, smooth and precise.
I think that what I have described above, would be difficult to capture in video clearly .