// Based on Learning Processing
// Daniel Shiffman
// http://www.learningprocessing.com
// Example 20-1: Simple Sound Playback

import processing.sound.*;
SoundFile song;
Amplitude amp;
float threshold = 0.25;

void setup() {
  size(640, 360);
  song = new SoundFile(this, "beat.aiff");
 
  // You might get IndexOutOfBoundsException error when loading a mp3 file with mono channel
  //song = new SoundFile(this, "beat.mp3");

  song.loop();
  amp = new Amplitude(this);
  amp.input(song);
}

void draw() {
  background(amp.analyze()*255);
  //if (amp.analyze()>threshold)
  //  background(255);
  //else
  //  background(0);
}