Array of SoundFile

Hi there, i try to get an array of SoundFile to easy change/pass from one to another by press a button, may i ask for help to archive a simple result like.
Thanks
Gianmaria

import processing.sound.*;
SoundFile sounds;

private static int blk;
private static int sub;
private static int subDiv;
private static Button nextButt;

void setup() {
  size(640, 360);
  background(255);
  blk = width/20;
  sub = blk/11;
  subDiv = blk/22;
  nextButt = new Button(blk*18, 6*blk, blk*2, blk, 11);
    
  //file0 = new SoundFile(this, "00.mp3");
  //file0.play();
  //file1 = new SoundFile(this, "01.mp3");
  //file1.play();
  
  sounds = new SoundFile(this, "02.mp3");
  sounds.amp(0.25);
  sounds.play();
}      

void draw() {
  nextButt.display();   
}

void mousePressed() {
nextButt.click(mouseX, mouseY);
if (nextButt.clicked) {}
}

final private class Button {    
  int x, w;   
  int y, h;    
  boolean clicked;
  int casa;
  // Constructor initializes all variables
  Button(int tempX, int tempY, int tempW, int tempH, int csa) {    
    x  = tempX;   
    y  = tempY;  
    w  = tempW;   
    h  = tempH;  
    casa = csa;
  }    

 final private void click(int mx, int my) {
    if (mx > x && mx < x + w && my > y && my < y + h) {
      clicked = !clicked;
    }
  }

  final private void display() {
    if (clicked) {
      clicked = !clicked; 
      fill(191);
    } else {
      fill(95);
    }
    rect(x+sub, y+sub, w-(sub*2), h-(sub*2));
    fill(31);
    font(x+subDiv, y+subDiv, casa);
  }
} 


private final void left( int x, int y) {
  rect(x+sub*5, y+sub*3, sub, sub);
  rect(x+sub*4, y+sub*4, sub, sub);
  rect(x+sub*3, y+sub*5, sub, sub);
  rect(x+sub*4, y+sub*6, sub, sub);
  rect(x+sub*5, y+sub*7, sub, sub);
}

private final void right( int x, int y) {
  rect(x+sub*3, y+sub*3, sub, sub);
  rect(x+sub*4, y+sub*4, sub, sub);
  rect(x+sub*5, y+sub*5, sub, sub);
  rect(x+sub*4, y+sub*6, sub, sub);
  rect(x+sub*3, y+sub*7, sub, sub);
}

private final void on( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*4, sub);
  rect(x+sub*3, y+sub*4, sub, sub*3);
  rect(x+sub*5, y+sub*4, sub, sub*3);
  rect(x+sub*7, y+sub*4, sub, sub*3);
}

private final void play( int x, int y) {
  rect(x+sub*3, y+sub*3, sub, sub*5);
  rect(x+sub*4, y+sub*4, sub, sub*3);
  rect(x+sub*5, y+sub*5, sub, sub);
}

private final void stp( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*5, sub*5);
}

private final void one( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*5, y+sub*4, sub, sub*3);
  rect(x+sub*3, y+sub*7, sub*5, sub);
}

private final void two( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*5, sub);
  rect(x+sub*7, y+sub*4, sub, sub);
  rect(x+sub*3, y+sub*6, sub, sub);
  rect(x+sub*3, y+sub*5, sub*5, sub);
  rect(x+sub*3, y+sub*7, sub*5, sub);
}

private final void tre( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*4, sub);
  rect(x+sub*7, y+sub*3, sub, sub*5);
  rect(x+sub*3, y+sub*5, sub*4, sub);
  rect(x+sub*3, y+sub*7, sub*4, sub);
}

private final void four( int x, int y) {
  rect(x+sub*7, y+sub*3, sub, sub*5);
  rect(x+sub*3, y+sub*6, sub*4, sub);
  rect(x+sub*4, y+sub*5, sub, sub);
  rect(x+sub*5, y+sub*4, sub, sub);
  rect(x+sub*6, y+sub*3, sub, sub);
}

private final void five( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*5, sub);
  rect(x+sub*3, y+sub*4, sub, sub);
  rect(x+sub*7, y+sub*6, sub, sub);
  rect(x+sub*3, y+sub*5, sub*5, sub);
  rect(x+sub*3, y+sub*7, sub*5, sub);
}

private final void six( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*5, sub);
  rect(x+sub*7, y+sub*6, sub, sub);
  rect(x+sub*3, y+sub*4, sub, sub*4);
  rect(x+sub*3, y+sub*5, sub*5, sub);
  rect(x+sub*3, y+sub*7, sub*5, sub);
}


private final void seven( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*5, sub);
  rect(x+sub*7, y+sub*4, sub, sub);
  rect(x+sub*6, y+sub*5, sub, sub);
  rect(x+sub*5, y+sub*6, sub, sub*2);
}


private final void eight( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*5, sub);
  rect(x+sub*7, y+sub*4, sub, sub*3);
  rect(x+sub*3, y+sub*4, sub, sub*3);
  rect(x+sub*3, y+sub*5, sub*5, sub);
  rect(x+sub*3, y+sub*7, sub*5, sub);
}

private final void nine( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*5, sub);
  rect(x+sub*7, y+sub*4, sub, sub*3);
  rect(x+sub*3, y+sub*4, sub, sub*2);
  rect(x+sub*3, y+sub*5, sub*5, sub);
  rect(x+sub*3, y+sub*7, sub*5, sub);
}

private final void cop( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*5, sub);
  rect(x+sub*7, y+sub*4, sub, sub*3);
  rect(x+sub*3, y+sub*4, sub, sub*3);
  rect(x+sub*3, y+sub*7, sub*5, sub);
}

private final void paste( int x, int y) {
  rect(x+sub*3, y+sub*3, sub, sub);
  rect(x+sub*3, y+sub*5, sub, sub);
  rect(x+sub*3, y+sub*7, sub, sub);
  rect(x+sub*4, y+sub*4, sub, sub);
  rect(x+sub*4, y+sub*6, sub, sub);
  rect(x+sub*6, y+sub*4, sub, sub);
  rect(x+sub*6, y+sub*6, sub, sub);
  rect(x+sub*5, y+sub*3, sub, sub);
  rect(x+sub*5, y+sub*5, sub, sub);
  rect(x+sub*5, y+sub*7, sub, sub);
  rect(x+sub*7, y+sub*3, sub, sub);
  rect(x+sub*7, y+sub*5, sub, sub);
  rect(x+sub*7, y+sub*7, sub, sub);
}

private final void clea( int x, int y) {
  rect(x+sub*3, y+sub*3, sub, sub);
  rect(x+sub*3, y+sub*7, sub, sub);
  rect(x+sub*4, y+sub*4, sub, sub);
  rect(x+sub*4, y+sub*6, sub, sub);
  rect(x+sub*6, y+sub*4, sub, sub);
  rect(x+sub*6, y+sub*6, sub, sub);
  rect(x+sub*5, y+sub*5, sub, sub);
  rect(x+sub*7, y+sub*3, sub, sub);
  rect(x+sub*7, y+sub*7, sub, sub);
}

private final void plus( int x, int y) {
  rect(x+sub*3, y+sub*5, sub*5, sub);
  rect(x+sub*5, y+sub*3, sub, sub*5);
}

private final void less( int x, int y) {
  rect(x+sub*3, y+sub*5, sub*5, sub);
}

private final void s( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*3, y+sub*5, sub*3, sub);
  rect(x+sub*3, y+sub*7, sub*3, sub);
  rect(x+sub*3, y+sub*4, sub, sub);
  rect(x+sub*5, y+sub*6, sub, sub);
}
private final void a( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*3, y+sub*5, sub*3, sub);
  rect(x+sub*3, y+sub*3, sub, sub*5);
  rect(x+sub*5, y+sub*3, sub, sub*5);
}
private final void v( int x, int y) {
  rect(x+sub*3, y+sub*3, sub, sub*4);
  rect(x+sub*4, y+sub*7, sub, sub);
  rect(x+sub*5, y+sub*3, sub, sub*4);
}
private final void e( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*3, y+sub*5, sub*3, sub);
  rect(x+sub*3, y+sub*7, sub*3, sub);
  rect(x+sub*3, y+sub*4, sub, sub * 3);
}

private final void sav(int x, int y){
s(x,y);a(x+sub*4,y);v(x+sub*8,y);e(x+sub*12,y);
}

private final void l( int x, int y) {
  rect(x+sub*3, y+sub*3, sub, sub*5);
  rect(x+sub*3, y+sub*7, sub*3, sub);
}
private final void o( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*3, y+sub*7, sub*3, sub);
  rect(x+sub*3, y+sub*3, sub, sub*5);
  rect(x+sub*5, y+sub*3, sub, sub*5);
}
private final void d( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*2, sub);
  rect(x+sub*3, y+sub*7, sub*2, sub);
  rect(x+sub*3, y+sub*3, sub, sub*5);
  rect(x+sub*5, y+sub*4, sub, sub*3);
}

private final void loa(int x, int y){
l(x,y);o(x+sub*4,y);a(x+sub*8,y);d(x+sub*12,y);
}

private final void t( int x, int y) {
  rect(x+sub*4, y+sub*3, sub, sub*5);
  rect(x+sub*3, y+sub*3, sub*3, sub);
}

private final void u( int x, int y) {
  rect(x+sub*3, y+sub*3, sub, sub*4);
  rect(x+sub*3, y+sub*7, sub*3, sub);
  rect(x+sub*5, y+sub*3, sub, sub*4);
}

private final void p( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*3, y+sub*5, sub*3, sub);
  rect(x+sub*3, y+sub*3, sub, sub*5);
  rect(x+sub*5, y+sub*3, sub, sub*3);
}

private final void setu(int x, int y){
s(x,y);e(x+sub*4,y);t(x+sub*8,y);u(x+sub*12,y);p(x+sub*16,y);
}

private final void h( int x, int y) {
  rect(x+sub*3, y+sub*5, sub*3, sub);
  rect(x+sub*3, y+sub*3, sub, sub*5);
  rect(x+sub*5, y+sub*3, sub, sub*5);
}

private final void c( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*3, y+sub*3, sub, sub*5);
  rect(x+sub*3, y+sub*7, sub*3, sub);
}

private final void n( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*3, y+sub*3, sub, sub*5);
  rect(x+sub*5, y+sub*3, sub, sub*5);
}

private final void channel(int x, int y){
c(x,y);h(x+sub*4,y);a(x+sub*8,y);n(x+sub*12,y);n(x+sub*16,y);e(x+sub*20,y);l(x+sub*24,y);
}

private final void note(int x, int y){
n(x,y);o(x+sub*4,y);t(x+sub*8,y);e(x+sub*12,y);
}

private final void i( int x, int y) {
  rect(x+sub*4, y+sub*3, sub, sub*5);
}

private final void y( int x, int y) {
  rect(x+sub*4, y+sub*5, sub, sub*3);
  rect(x+sub*3, y+sub*3, sub, sub*2);
  rect(x+sub*5, y+sub*3, sub, sub*2);
}

private final void velocity(int x, int y){
v(x,y);e(x+sub*4,y);l(x+sub*8,y);o(x+sub*12,y);c(x+sub*16,y);i(x+sub*19,y);t(x+sub*22,y);y(x+sub*26,y);
}

private final void f( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*3, y+sub*5, sub*3, sub);
  rect(x+sub*3, y+sub*3, sub, sub*5);

}

private final void noteOffCh(int x, int y){
note(x,y);o(x + sub *16,y);f(x + sub *20,y);f(x + sub *24,y);channel(x + sub *32,y);
}


private final void x( int x, int y) {
  rect(x+sub*4, y+sub*5, sub, sub);
  rect(x+sub*3, y+sub*3, sub, sub*2);
  rect(x+sub*5, y+sub*3, sub, sub*2);
  rect(x+sub*3, y+sub*6, sub, sub*2);
  rect(x+sub*5, y+sub*6, sub, sub*2);
}
private final void xAxis(int x, int y){
a(x ,y);x(x + sub *4,y);i(x + sub *7,y);s(x + sub *10,y);t(x + sub * 18,y);o(x + sub * 22,y);c(x + sub * 30,y);c(x + sub * 34,y);
}

private final void m( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*4, sub);
  rect(x+sub*3, y+sub*4, sub, sub*4);
  rect(x+sub*5, y+sub*4, sub, sub*4);
  rect(x+sub*7, y+sub*3, sub, sub*5);
}

private final void axisMin(int x, int y){
a(x ,y);x(x + sub *4,y);i(x + sub *7,y);s(x + sub *10,y);m(x + sub *18,y);i(x + sub *23,y);n(x + sub *26,y);
}

private final void font(int x, int y, int cas) {
  switch(cas) {
  case 0:
    cop(x, y);
    break;
  case 1:
    one(x, y);
    break;
  case 2:
    two(x, y);
    break;
  case 3:
    tre(x, y);
    break;
  case 4:
    four(x, y);
    break;
  case 5:
    five(x, y);
    break;
  case 6:
    six(x, y);
    break;
  case 7:
    seven(x, y);
    break;
  case 8:
    eight(x, y);
    break;
  case 9:
    nine(x, y);
    break;
  case 10:
    left(x, y);
    break;
  case 11:
    right(x, y);
    break;
  case 12:
    on(x, y);
    break;
  case 13:
    play(x, y);
    break;
  case 14:
    stp(x, y);
    break;
  case 15:
    paste(x, y);
    break; 
  case 16:
    break;
  case 17:
    plus(x, y);
    break; 
  case 18:
    less(x, y);
    break; 
  case 19:
    sav(x, y);
    break; 
  case 20:
    loa(x, y);
    break;   
  case 21:
    clea(x, y);
    break;
      case 22:
    setu(x, y);
    break;
    /*
          case 23:
    randVelDot(x, y);
    break;
              case 24:
    randDot(x, y);
    break;
                  case 25:
    velDot(x, y);
    break;
    */
  }
}




/*
void randVelDot( int x, int y) {
  rect(x+sub*3, y+sub*3, sub*3, sub);
  rect(x+sub*5, y+sub*4, sub, sub);
  rect(x+sub*3, y+sub*5, sub*3, sub);
  rect(x+sub*3, y+sub*7, sub, sub);  
  rect(x+sub*7, y+sub*3, sub, sub*3);
  rect(x+sub*7, y+sub*7, sub, sub); 
}
void randDot( int x, int y) {
  rect(x+sub*4, y+sub*3, sub*3, sub);
  rect(x+sub*6, y+sub*4, sub, sub);
  rect(x+sub*4, y+sub*5, sub*3, sub);
  rect(x+sub*4, y+sub*7, sub, sub);  
}

void velDot( int x, int y) {

  rect(x+sub*5, y+sub*3, sub, sub*3);
  rect(x+sub*5, y+sub*7, sub, sub); 
}
*/

before setup

SoundFile[] mySoundFiles = new SoundFile[22]; // or many you want 

in setup:

mySoundFiles [0]  = new SoundFile(this, "00.mp3");
mySoundFiles [1]  = new SoundFile(this, "01.mp3");

(or use a for loop if you can)

Then have one var for the index : indexSoundFiles

and increase it when playing the next song

There is a tutorial on arrays too