Digital Pins Problem

Using Arduino IDE 1.x
9

I ve figured how to make my laser harp playing a little better than before.You see my problem was that when i had one speaker for producing the notes,when i interrupt one and only laser beam the tone played well.But when i was interrupting two laser beams at the same time the notes for each interrupted beam was played at the same time from the one and only speaker and the mixing of the two tones was awfull. Now i 've conncted 3 speakers and i have 6 laser beams. The first laser goes with speaker 1 ,the second laser goes with speaker 2 ,the third laser goes with speaker 3, the fourth lase goes with speaker 1, the fifth laser goes with speaker 2 and the sixth laser goes with speaker 3.The only problem is when i hit at the same time the laser 1 and 4 together or the laser 2 and 5 together or the laser 3 and 6 together because these pairs are using the same speaker. So i've changed my source code a little and if one of the 3 combinations comes up a totally different sound is played by the speaker connected with the pair.

#include <Tone.h>

int lightPin1 = 0;  //define a pin for Photo resistor
int lightPin2 = 1;  //define a pin for Photo resistor
int lightPin3 = 2;  //define a pin for Photo resistor
int lightPin4 = 3;  //define a pin for Photo resistor
int lightPin5 = 4;  //define a pin for Photo resistor
int lightPin6 = 5;  //define a pin for Photo resistor

int reading;
int reading2;

// You can declare the tones as an array

Tone aLaser1;
Tone aLaser2;
Tone aLaser3;
Tone aLaser4;
Tone aLaser5;
Tone aLaser6;

void setup(void)
{
  Serial.begin(9600);
  aLaser1.begin(3);
  aLaser2.begin(4);
  aLaser3.begin(5);
}

void loop(void)
{
  reading = analogRead(lightPin1);
  if(reading < 50) 
  {
    aLaser1.play(130,400);
  }
  
  reading = analogRead(lightPin2);
  if(reading < 50) 
  {
    aLaser2.play(140,400);
  }
  
  reading = analogRead(lightPin3);
  if(reading < 50) 
  {
    aLaser3.play(160,400);
  }
  
  reading = analogRead(lightPin4);
  if(reading < 50) 
  {
    aLaser1.play(170,400);
  }
  
  reading = analogRead(lightPin5);
  if(reading < 50) 
  {
    aLaser2.play(190,400);
  }
  
  reading = analogRead(lightPin6);
  if(reading < 50) 
  {
    aLaser3.play(200,400);
  }
  
  
  ////////////////////////////////////////////////////
  //         This is the code for the combinations          //
  //////////////////////////////////////////////////// 

  reading = analogRead(lightPin6);
  reading2 = analogRead(lightPin3);

  while(reading < 50 && reading2 < 50) 
  {
    aLaser3.play(220,400);
    
       reading = analogRead(lightPin6);
       reading2 = analogRead(lightPin3);
       if(reading >50 || reading2 >50)
       aLaser3.stop();
  }
  
  
  reading = analogRead(lightPin5);
  reading2 = analogRead(lightPin2);
  while(reading < 50 && reading2 < 50) 
  {
    aLaser2.play(240,400);
    
       reading = analogRead(lightPin5);
       reading2 = analogRead(lightPin2);
       if(reading >50 || reading2 >50)
       aLaser2.stop();
  }
  
  
  reading = analogRead(lightPin4);
  reading2 = analogRead(lightPin1);
  while(reading < 50 && reading2 < 50) 
  {
    aLaser1.play(260,400);
    
       reading = analogRead(lightPin4);
       reading2 = analogRead(lightPin1);
       if(reading >50 || reading2 >50)
       aLaser1.stop();
  }
       
}//void loop