Processing Beads library Granular synthesis

GranularSample.pde

import beads.*;
import java.util.Arrays; 
AudioContext ac;
GranularSamplePlayer player;

void setup() {
  size(800, 600);
  ac = new AudioContext();
  Sample sample = SampleManager.sample(dataPath("Violet.mp3"));
  player = new GranularSamplePlayer(ac, sample);
  player.setLoopType(SamplePlayer.LoopType.LOOP_FORWARDS);
  Gain g = new Gain(ac, 2, 1.0);
  g.addInput(player);
  ac.out.addInput(g);
  ac.start();
}

void draw() {
  background(0);

  if (player != null) {
    float rate = map(mouseX, 0, width, 0.0, 3.0);
    Static rateValue = new Static(ac, rate);
    player.setRate(rateValue);

    float speed = map(mouseY, 0, height, 0.0, 3.0);
    Static speedValue = new Static(ac, speed);
    player.setPitch(speedValue);
  }
}