fade 3 leds with bonescript

gistfile1.js

var b = require('bonescript');

// setup starting conditions
var awStep1 = (Math.random() + 1) * 0.01;
var awValue1 = awStep1;
var awDirection1 = 1;
var awPin1 = "P9_14";

var awStep2 = awStep1;
while (Math.abs(awStep2 - awStep1) < 0.002) {
    awStep2 = (Math.random() + 1) * 0.01;
}
var awValue2 = awStep2 * 10;
var awDirection2 = 1;
var awPin2 = "P9_21";

var awStep3 = awStep1;
while (Math.abs(awStep3 - awStep1) < 0.002 || Math.abs(awStep3 - awStep2) < 0.002) {
    awStep3 = (Math.random() + 1) * 0.01;
}
var awValue3 = awStep3 * 20;
var awDirection3 = 1;
var awPin3 = "P9_22";

// configure pin 
b.pinMode(awPin1, b.OUTPUT);
b.pinMode(awPin2, b.OUTPUT);
b.pinMode(awPin3, b.OUTPUT);

// call function to update brightness every 10ms
setInterval(fade, 10);

// function to update brightness
function fade() {
 b.analogWrite(awPin1, awValue1);
 awValue1 = awValue1 + (awDirection1*awStep1);
 if(awValue1 > 1.0) { awValue1 = 1.0; awDirection1 = -1; }
 else if(awValue1 <= awStep1) { awValue1 = awStep1; awDirection1 = 1; }

 b.analogWrite(awPin2, awValue2);
 awValue2 = awValue2 + (awDirection2*awStep2);
 if(awValue2 > 1.0) { awValue2 = 1.0; awDirection2 = -1; }
 else if(awValue2 <= awStep2) { awValue2 = awStep2; awDirection2 = 1; }

 b.analogWrite(awPin3, awValue3);
 awValue3 = awValue3 + (awDirection3*awStep1);
 if(awValue3 > 1.0) { awValue3 = 1.0; awDirection3 = -1; }
 else if(awValue3 <= awStep3) { awValue3 = awStep3; awDirection3 = 1; }
}