Impossible to vary square wave FREQUENCY output based on a PWM input?

Projects Programming
14 
const byte RCInputPin = 2;
const byte StepPin = 3;
const byte DirectionPin = 4;
const unsigned MinStepRate = 70;
const unsigned MaxStepRate = 1600;

void setup()
{
  pinMode(RCInputPin, INPUT);
  pinMode(StepPin, OUTPUT);
  pinMode(DirectionPin, OUTPUT);
  digitalWrite(DirectionPin, LOW);
}

void loop()
{
  unsigned long inputPulseWidth = pulseIn(RCInputPin, HIGH, 30000);
  if (inputPulseWidth ! 0) // not a timeout
  {
    int stepRate = map(inputPulseWidth, 500, 2500, MinStepRate, MaxStepRate);
    tone(StepPin, stepRate);
  }
}
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