Because the signal is digital, the throttle response curve has 14, 28 or 128 discrete speed steps.

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Discrete Speed Steps
Start Voltage
Mid Point Voltage, Max Voltage
Loadable Speed Tables

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Back EMF
Acceleration and Deceleration Rates
The Throttle Response Curve, Adjusting

Adapted from "Digital Command Control: The Wave of the Future", by Zana and A.J. Ireland.