function draw() {
  background(250);

  /** 
   * Analyze the sound as a waveform (amplitude over time)
   */
  waveform = fft.waveform();

  // Draw snapshot of the waveform
  beginShape();
  for (var i = 0; i< waveform.length; i++){
    stroke(5);
    strokeWeight(5);
    vertex(i*2, map(waveform[i], -1, 1, height, 0) );
  }
  endShape();
}
Create an FFT object.
 Accepts optional parameters for
   - Smoothing 
   - Length of the FFT's analyze/waveform array. Must be a power of two between 16 and 1024 (default).