Wind map with Processing

Hi there, I'm trying to create some visuals based on a Wind Map. I got the visuals to work with the parameters setting the thickness and turbulence of the particles but I would like to be able to control those parameters through sliders on an interface so I have more control of it.

I added the sliders to control these parameters but It's not changing the visuals live for some reason. I think it might be because of the positioning of the elements in my code, so I will past it here a section of my code and hopefully someone with experience can point me where i'm getting this wrong?

int sParticles = 5000;
int sNoiseScale = 5000;
int sLength = 5;

float sRandomA = .5;
float sRandomB = 2;



int num = sParticles;
Particle[] particles = new Particle[num];
float noiseScale=sNoiseScale, noiseStrength=5; // Turbulence

void setup() {

  cp5 = new ControlP5(this);
  cp5.addSlider("sParticles").setPosition(0,0).setRange(0,10000);
  cp5.addSlider("sNoiseScale").setPosition(160,0).setRange(0,10000);
  cp5.addSlider("sLength").setPosition(330,0).setRange(0,20);

  cp5.addSlider("sRandomA").setPosition(490,0).setRange(0,5);
  cp5.addSlider("sRandomB").setPosition(650,0).setRange(0,5);

  size(1920, 1080);
  noStroke();
  for (int i=0; i<num; i++) {
    PVector loc = new PVector(random(width*1.2),
    random(height), random(sRandomA, sRandomB)); // Thickness

    float angle = random(TWO_PI);
    PVector dir = new PVector(cos(angle), sin(angle));
    float speed = random(.5, 2);
    particles[i]= new Particle(loc, dir, speed);
  }
}