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I have a sigmoid curve speed function (attached pic) in a 28*2 powered stepper-motor photographic timelapse controller device that allows smooth transitions between speed steps. I need to distort the curve in some way to increase/decrease the area under the curve (distance) without changing...

Ive been struggling with linear speed stepper contol for a while, the PWM is too fast and the math for real time delay (pauseus)/freq conversion is too hard (for me) and slow. So I hand generated 100 point and 200 point conversion look-up tables that some here may find (very :)) usefull. The...