the MIDI BUS

Hi! i cant resolve a problem here. Im trying to do a music visualizer. The idea is very simple; when i press a Key in my midiController add a new Particle, and when i release, delete that Particle. but when i release a key, all particles are delete. What i was looking for is that only delete the Particle what was correspond that key that i was release. here the code:

import themidibus.*;
MidiBus myBus;

int pitchs;
float cc [] =new float [256];
boolean note;
ArrayList<Particle>part;

void setup () {

  fullScreen();
  background(0);
  note = true;
  myBus= new MidiBus(this, "visuals", "visuals");
  part = new ArrayList <Particle>();
}

void draw() {

  background(0);

  for (int i = part.size()-1; i>= 0; i--) {
    Particle p = part.get(i);
    p.update();
    p.display();

    if(p.isDead()){
    part.remove(i);
    }
  }
}

void noteOff(int channel, int pitch, int velocity) {

  println();
  println("Note Off:");
  println("--------");
  println("Channel:"+channel);
  println("Pitch:"+pitch);
  println("Velocity:"+velocity);
  note=false;
  pitchs = pitch;
}

void noteOn(int channel, int pitch, int velocity) {

  println();
  println("Note On:");
  println("--------");
  println("Channel:"+channel);
  println("Pitch:"+pitch);
  println("Velocity:"+velocity);
  pitchs= pitch;
  note = true;
  part.add(new Particle(random(width), random(height), pitchs, note));
}



void controllerChange(int channel, int number, int value) {
  // Receive a controllerChange
  println();
  println("Controller Change:");
  println("--------");
  println("Channel:"+channel);
  println("Number:"+number);
  println("Value:"+value);

  cc[number]=map(value, 0, 127, 0, 1);
}

class Particle {

  PVector pos, vel, acel;
  float pitch;
  float life;
  boolean notes;

  Particle (float x, float y, float pitchs) {
    pos = new PVector(x, y);
    vel = new PVector(random(-1, 1), random(-1, 1));
    acel = new PVector(0, 0);
    pitch = pitchs;
    life = 255;

  }

  void update() {
    pos.add(vel);
    vel.add(acel);
    vel.limit(1);
    life-=1;
  }

  void display() {
    float r = map(pitchs, 0, 127, 0, 200);
    fill(255);
    noStroke();
    ellipse(pos.x, pos.y, r, r);
  }

  boolean isDead() {

    if (note==false || life < 0) {
      return true;
    } else {
      return false;
    }
  }
}