Hello, 
Hard to explain, but here's the code 1st: 
Code:import gifAnimation.*;
import ddf.minim.*;
Minim minim;
AudioSnippet songR;
AudioSnippet songL;
int albumSize = 3;
int albumsize = 30;
int selectedPhoto = 0;
int selected = 0;
PImage[] photoAlbum;
PImage[] photo;
int timer;
Gif loopingGif;
int toestand = '1';
void setup() {
  photo = new PImage[albumsize];
  photoAlbum = new PImage[albumSize];
   size(1024, 768);
  
  photoAlbum[0] = loadImage("1.png");
  photoAlbum[1] = loadImage("2.png");
  photoAlbum[2] = loadImage("3.png");
  
  for(int i = 0;i<albumsize;i++){
  photo[i] = loadImage((i+1)+".jpg");
  }
  
  frameRate(3);
  loopingGif = new Gif(this, "LoadScreen.gif");
  loopingGif.loop();
  timer = 0;
  imageMode(CENTER);
  
  minim = new Minim(this);
  songR = minim.loadSnippet("rechts.wav");
  songL = minim.loadSnippet("links.wav");
}
void draw() {
  timer++;
  image(loopingGif, width/2, height/2);
  if(timer>=15){
      switch (toestand){
      case '1':
        if (photoAlbum[selectedPhoto] != null) {
        image(photoAlbum[selectedPhoto], width/2, height/2);
        }
      break;
      
      case '2':
        if (photo[selected] != null) {
        image(photo[selected], width/2, height/2);
        }
      break;
      }
  }
}  
void keyReleased() {
  if(key ==',') {
    songR.play();
    songR.rewind();
    if(selectedPhoto < 1) {
      selectedPhoto = photoAlbum.length - 1;
    } else {
      selectedPhoto--;
    }
  } 
  if(key=='m') {
    int toestand ='2';
    println(selected);
  }
  if (key == '.') {
    songL.play();
    songL.rewind();
    if(selectedPhoto > photoAlbum.length - 2){
      selectedPhoto = 0;
    } else {
      selectedPhoto++;
    }
  }
    println(selectedPhoto);
    if (key ==',') {
          if(selected < 1) {
            selected = photo.length - 1;
          } 
          else {
            selected--;
          }
        }
        if (key =='.') {
          if(selected > photo.length - 2) {
            selected = 0;
          } else { 
            selected++;
          }
        }
        
  } 
}
 
Don't mind the looping gif, because thats not important right now, but I've got a question about using 2 buttons at the same time to go somewhere. As you can see, there are already 2 keys declared to do something. , is used to go to the previous picture and . is declared to go to the next picture. But now I'd like to press . and , at the same time so that they go to another loop of pictures. (That's what  
Code:  for(int i = 0;i<albumsize;i++){
  photo[i] = loadImage((i+1)+".jpg");
  } 
 is for. It's the other loop.)
If i do if (key =='.' && key==',') it just doesn't work. It does nothing. Can someone help me? 
Thanks in advance