As I am a newbie. I tried to figure out some easy things. So how can I change a pic sequence with mousePressed? I tried this but doesnt work..

//

 int numFrames = 4;
 int frame = 0;

PImage[] images = new PImage[numFrames];
   
void setup()
{
 size(1280, 854);
 framerate(24);
 
 if(mousePressed == true) {

 images[0]  = loadImage("IMG_0132.gif");
 images[1]  = loadImage("IMG_0133.gif");
 images[2]  = loadImage("IMG_0135.gif");
 images[3]  = loadImage("IMG_0136.gif");  
}  
 else{
 
 images[0]  = loadImage("noiseeland_0001.gif");
 images[1]  = loadImage("noiseeland_0002.gif");
 images[2]  = loadImage("noiseeland_0003.gif");
 images[3]  = loadImage("noiseeland_0004.gif");

 
}


}

void draw()
{
 frame = (frame+1)%numFrames;  // Use % to cycle through frames
 image(images[frame], 0, 0);
}

I understood now that I have to load all my images in the setup void, then I can use them in the draw void.. But how can I talk to one specific sequence? For example, if I have 8 picts and I want to play only the first four when pressing key a and the latter 4 when pressing s. then also i. E when i press d then just play Frame number 5 and 6.
...
any help would be appreciated

so its me again :-)
1. does anybody know how I can change the framerate(speed of the pics), while running the applet? I suppose it is possible with MouseX or something?
2. can I randomize the frames the applet plays?
3. how is it with OSC communication anybody knows how to do that in this special case?

//code
int numFrames = 63;
int frame = 0;
int start = 0;
int end = 1;

PImage[] images = new PImage[numFrames];

void setup(){

 size(1000, 768);
 framerate(1);
 
 for(int i=0; i<numFrames; i++) {
   String imageName = "kk00" + ((i < 10) ? "0" : "") + i + ".gif";
   images[i] = loadImage(imageName);
 }


}

void draw(){
 image(images[frame], 0, 0);
 frame++;
 if (frame > end){
   frame = start;
 }
}

void keyPressed(){
 //play sequence 1 when "1" is pressed
 //play sequence 2 when "2","3","4" is pressed
 switch(key){
 case '1':
   start = 0;
   end = 1;
   break;
 case '2':
   start = 3;
   end = 5;
   break;
 case '3':
   start = 5;
   end = 7;
   break;
 case '4':
   start = 9;
   end = 11;
   break;
 case '5':
   start = 13;
   end = 19;
   break;
 case '6':
   start = 20;
   end = 30;
   break;
 case '7':
   start = 31;
   end = 34;
   break;
 case '8':
   start = 35;
   end = 40;
   break;
case '9':
   start = 41;
   end = 44;
   break;
case '0':
   start = 45;
   end = 55;
   break;
 case 'o':
   start = 56;
   end = 62;
   break;
    case 'p':
   start = 2;
   end = 3;
   break;
    case 'l':
   start = 4;
   end = 62
   ;
   break;
 }
}