Mr. 'KIT' - A Variable Version

Remember Knight Rider?  Some of us do...
Here is a simple 'KIT' with a variable rate.

And the sketch...

/*Remember Knight Rider's 'KIT'?  Well this code gives
  the same effect and adds the ability to control the
  rate of the 'scan'.
  This uses 12 LEDs attached to digital pins 2~13 and
  a potentiometer (I used 1k) across power pins 5V and
  GND, with the wiper attached to analog pin 0.
 
  Enjoy - Clark Buckley 2012
*/

float rate;                  //Reads value from A0

void setup()
{
  //Sets output pins
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(2, OUTPUT);
}

void loop()
{
  for (int x=2; x<14; x++)    //Scan loop, pin 2->13
  {  digitalWrite(x, HIGH);   //LED 'On'
     rate = analogRead(0);    //Read potentiometer
     delay((rate/1023)*100);  //Leaves LED 'On'
     digitalWrite(x, LOW);    //LED 'Off'
  }
  for (int y=12; y>2; y--)    //Scan loop, pin 12->3
  {  digitalWrite(y, HIGH);   //LED 'On'
     rate = analogRead(0);    //Read potentiometer
     delay((rate/1023)*100);  //Leaves LED 'On'
     digitalWrite(y, LOW);    //LED 'Off'
  }
}