How do you reset a Slider?

I use a slider to vary a speed but I want, with a button, to be able to do an emergency stop which, among other things, resets the slider chip.
I don't how to do?

speed of what?

Sorry for my question.
I found the answer

(100 is my starting position)

For ABG: I send 100-228 to an Arduino via Bluetooth, which generates a DCC signal for train

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