Issue with StandardFirmata and Arduino Mega 2560

I am using Arduino 1.0.5. I uploaded the StandardFirmata sketch onto my mega, here is my processing sketch:

import ddf.minim.*;
import ddf.minim.ugens.*;
import processing.serial.*;
import cc.arduino.*;
 
//this object represents your board
Arduino arduino;

//this is the minim environment
Minim minim;

AudioOutput   out;

AudioPlayer cow;
AudioPlayer sheep;
AudioPlayer unicorn;
AudioPlayer frog;
AudioPlayer dinosaur;



Oscil         osc;

Delay myDelay;

Midi2Hz midi;
 
//this is the object that plays your file
AudioPlayer player;
AudioPlayer player2;
 
//use variables for pin numbers 
int sensorPin = 0;
//led pin
int SPACE_PIN = 51;
int SPACE_PIN2 = 49;
int SPACE_PIN3 = 47;
int SPACE_PIN4 = 45;
int SPACE_PIN5 = 43;
int SPACEREDLED_PIN = 52;

//button
int photosensorPin = 7;
int photoResistorPin = 1;
int photoResistorPin2 = 2;
int cowPin = 3;
int sheepPin = 4;
int unicornPin = 5;
int frogPin = 7;
int dinosaurPin = 6;
 
//this is the minimum value from the sensor that will trigger the sound
int threshold = 300;
int photoThreshold = 150;
int photoThreshold2 = 150;
int cowThreshold = 250;
int sheepThreshold = 450;
int unicornThreshold = 250;
int frogThreshold = 250;
int dinosaurThreshold = 250;
float threshold2 = 0.5;

float photoresistor=0;
int photoresistorLed=0;
float photoresistor2=0;
int photoresistorLed2=0;

 
void setup()
{
  size(640, 200);
 
  //the arduino object needs to be created at the beginning
  println(Arduino.list());
  arduino = new Arduino(this, Arduino.list()[4], 57600);
 
  arduino.pinMode(SPACE_PIN, Arduino.OUTPUT);
  arduino.pinMode(SPACE_PIN2, Arduino.OUTPUT);
  arduino.pinMode(SPACE_PIN3, Arduino.OUTPUT);
  arduino.pinMode(SPACE_PIN4, Arduino.OUTPUT);
  arduino.pinMode(SPACE_PIN5, Arduino.OUTPUT);
  arduino.pinMode(SPACEREDLED_PIN, Arduino.OUTPUT);

  //initialize minim
  minim = new Minim(this);
 
  // initialize myDelay with continual feedback and audio passthrough
  myDelay = new Delay( 0.4, 0.5, true, true );

  out = minim.getLineOut();


  osc = new Oscil( 440, 0.5 );

  
   cow = minim.loadFile("moo.wav");
   sheep = minim.loadFile("baa.mp3");
   unicorn = minim.loadFile("horse.mp3");
   frog = minim.loadFile("frog.mp3");
   dinosaur = minim.loadFile("dinogrowl.wav");

}
 
void draw()
{
    size(512, 200);

  //stop led being on constantly
  arduino.digitalWrite(SPACE_PIN, Arduino.LOW);
  arduino.digitalWrite(SPACE_PIN2, Arduino.LOW);
  arduino.digitalWrite(SPACE_PIN3, Arduino.LOW);
  arduino.digitalWrite(SPACE_PIN4, Arduino.LOW);
  arduino.digitalWrite(SPACE_PIN5, Arduino.LOW);
  arduino.digitalWrite(SPACEREDLED_PIN, Arduino.LOW);
  
  //define photoresistor
  photoresistor = arduino.analogRead(0);

  
  //define photoresistor
  //potentiometer = arduino.analogRead(0);

  //photoresistor with delay osc sounds for space
  float value = map(photoresistor,200,1700,0,16000);
  osc.setFrequency(value);

  //ufo
int photoResistorValue =  arduino.analogRead(photoResistorPin);
 // println(photoResistorValue); //print it for testing purposes
  //if photoresistor is greater than 100, turn on LED  
  if (photoResistorValue > photoThreshold)
  {
    //turn on LED
    arduino.digitalWrite(SPACEREDLED_PIN, Arduino.HIGH);

  }
  
  //stars
  int photoResistorValue2 =  arduino.analogRead(photoResistorPin2);
  //println(photoResistorValue2); //print it for testing purposes
  //if photoresistor is greater than 100, turn on LED  
  if (photoResistorValue2 > photoThreshold2)
  {
    //turn on LED
    arduino.digitalWrite(SPACE_PIN, Arduino.HIGH);
    arduino.digitalWrite(SPACE_PIN2, Arduino.HIGH);
    arduino.digitalWrite(SPACE_PIN3, Arduino.HIGH);
    arduino.digitalWrite(SPACE_PIN4, Arduino.HIGH);
    arduino.digitalWrite(SPACE_PIN5, Arduino.HIGH);


  }

  //cow noise
  //read an analog value from the sensor pin
  int cowValue =  arduino.analogRead(cowPin);
  //println(cowValue); //print it for testing purposes
  //check if the reproduction is in process if not don't trigger another sound
  if ( cow.isPlaying() == false && cowValue > cowThreshold)
  {
    cow.rewind();
    cow.play();
  }
  
  //sheep noise
    int sheepValue =  arduino.analogRead(sheepPin);
  //println(sheepValue); //print it for testing purposes
  //check if the reproduction is in process if not don't trigger another sound
  if ( sheep.isPlaying() == false && sheepValue > sheepThreshold)
  {
    sheep.rewind();
    sheep.play();
  }
  
  //unicorn noise
    //cow noise
  //read an analog value from the sensor pin
  int unicornValue =  arduino.analogRead(unicornPin);
 // println(unicornValue); //print it for testing purposes
  //check if the reproduction is in process if not don't trigger another sound
  if ( unicorn.isPlaying() == false && unicornValue > unicornThreshold)
  {
    unicorn.rewind();
    unicorn.play();
  }
  
  int dinosaurValue = arduino.analogRead(dinosaurPin);
    println(dinosaurValue); //print it for testing purposes
  //check if the reproduction is in process if not don't trigger another sound
  if ( dinosaur.isPlaying() == false && dinosaurValue > dinosaurThreshold)
  {
    dinosaur.rewind();
    dinosaur.play();
  }
    //frog noise
  //read an analog value from the sensor pin
  int frogValue =  arduino.analogRead(frogPin);
  println(frogValue); //print it for testing purposes
  //check if the reproduction is in process if not don't trigger another sound
  if ( frog.isPlaying() == false && frogValue > frogThreshold)
  {
    frog.rewind();
    frog.play();
  }
                  //drawings
                  // erase the window to black
                  background( 0 );
                  // draw using a white stroke
                  stroke( 255 );
                  // draw the waveforms
                  for( int i = 0; i < out.bufferSize() - 1; i++ )
                  {
                    // find the x position of each buffer value
                    float x1  =  map( i, 0, out.bufferSize(), 0, width );
                    float x2  =  map( i+1, 0, out.bufferSize(), 0, width );
                    // draw a line from one buffer position to the next for both channels
                    line( x1, 50 + out.left.get(i)*50, x2, 50 + out.left.get(i+1)*50);
                    line( x1, 150 + out.right.get(i)*50, x2, 150 + out.right.get(i+1)*50);
                  }   
                  //end of drawings
}

void stop()
{
  minim.stop();
  super.stop();
}

In this sketch I have 8 photo resistors working as sensors to control an oscillator, LED's and sound files. Everything works perfectly until I go past pin A5