void setup()
    {
        Serial.begin(9600); 
        pinMode(2,INPUT); 
        pinMode(3,INPUT); 
        pinMode(4,INPUT); 
        pinMode(5,INPUT); 
        pinMode(6,INPUT); 
        pinMode(7,INPUT); 
        pinMode(13,OUTPUT);
        pinMode(A0,INPUT); 
    }


    void loop () 
    {

      int button; 
      button = digitalRead(2); 
      Serial.print("Button1 : "); 
      Serial.print(button); 
      Serial.print(" "); 

      if (button == 1) 
      {
        digitalWrite(13,1); 
        tone(13,523.25);
      }else
      {
        digitalWrite(13,0);
        noTone(13);
      }
      /////////////////////
      int buttontwo; 
      buttontwo = digitalRead(3); 
      Serial.print("Button2 : "); 
      Serial.print(buttontwo); 
      Serial.print(" "); 

      if (buttontwo == 1) 
      {
        digitalWrite(13,1); 
        tone(13,587.33);
      }else
      {
        digitalWrite(13,0);
        noTone(13);
      }
      /////////////////////
      int buttonthree; 
      buttonthree = digitalRead(4); 
      Serial.print("Button3 : "); 
      Serial.print(buttonthree); 
      Serial.print(" "); 

      if (buttonthree == 1) 
      {
        digitalWrite(13,1); 
        tone(13,659.25);
      }else
      {
        digitalWrite(13,0);
        noTone(13);
      }
      /////////////////////
      int buttonfour; 
      buttonfour = digitalRead(5); 
      Serial.print("Button4 : "); 
      Serial.print(buttonfour); 
      Serial.print(" "); 

      if (buttonfour == 1) 
      {
        digitalWrite(13,1); 
        tone(13,698.46);
      }else
      {
        digitalWrite(13,0);
        noTone(13);
      }
      /////////////////////
      int buttonfive; 
      buttonfive = digitalRead(6); 
      Serial.print("Button5 : "); 
      Serial.print(buttonfive); 
      Serial.print(" "); 

      if (buttonfive == 1) 
      {
        digitalWrite(13,1); 
        tone(13,783.99);
      }else
      {
        digitalWrite(13,0);
        noTone(13);
      }
      /////////////////////
      int buttonsix; 
      buttonsix = digitalRead(7); 
      Serial.print("Button6 : "); 
      Serial.print(buttonsix); 
      Serial.print(" "); 

      if (buttonsix == 1) 
      {
        digitalWrite(13,1); 
        tone(13,880.00);
      }else
      {
        digitalWrite(13,0);
        noTone(13);
      }
      int pitch = analogRead(A0);
      Serial.print("Pitch Shifter : "); 
      Serial.println(pitch);
    }