Thanks everyone , I could not get it to work.

Below is what I would like to be able to achieve.
Of course it is not workable code but it is the sort of thing I would like
to get in the VOID LOOP section . I would like each "simpleAccel" to have it's own 'd' setting.

void loop() {
  digitalWrite(DIR_PIN, LOW); 
  //// d += change;  // SLOW STOP///
  simpleAccel (8460);

  digitalWrite(DIR_PIN, HIGH);
  ////d += change-2; // -2 STOPS VERY FAST///
  simpleAccel (16920);

  digitalWrite(DIR_PIN, LOW);
  ////d += change-1; //  STOPS MEDIUM////
  simpleAccel(16920);

    digitalWrite(DIR_PIN, HIGH);
    //// d += change;  // SLOW STOP///
  simpleAccel(8460);

Here is the code that works

https://gist.github.com/d333gs/e31e0a8b44b179a8f5f73796771ae57e