Filtering an mp3 file with minim

minim_band_pass_filter.pde

import ddf.minim.*;
import ddf.minim.effects.*;

float passBand;
float bandWidth;

Minim minim;
AudioPlayer player;
BandPass bandFilter;

void setup()
{
  size(500, 200);

  minim = new Minim(this);

  player = minim.loadFile("Example.mp3");
  player.loop();
  // make a band pass filter with a center frequency of 440 Hz and a bandwidth of 20 Hz
  // the third argument is the sample rate of the audio that will be filtered
  // it is required to correctly compute values used by the filter
  bandFilter = new BandPass(440, 20, player.sampleRate());

  player.addEffect(bandFilter);

  textSize(20);
}

void draw()
{
  background(0);

  text("passBand: " + passBand + "\nbandWidth: " + bandWidth, 50, 50);
}

void mouseMoved()
{
  // map the mouse position to the range [100, 10000], an arbitrary range of passBand frequencies
  passBand = map(mouseX, 0, width, 100, 2000);
  bandFilter.setFreq(passBand);
  //bandWidth = map(mouseY, 0, height, 50, 500);
  bandWidth = 200;
  bandFilter.setBandWidth(bandWidth);
}

void stop()
{
  // always close Minim audio classes when you finish with them
  player.close();
  // always stop Minim before exiting
  minim.stop();

  super.stop();
}