import processing.sound.*;

AudioIn input;
FFT fft;

//float smoothingFactor = 0.2;
float[] sum = new float[128];

public void setup() {
  size(512, 360);
  background(255);
  input = new AudioIn(this, 0);
  input.start();

  fft = new FFT(this, 128);
  fft.input(input);
}

public void draw() {

  background(125, 255, 125);
  fill(255, 0, 150);
  noStroke();

  fft.analyze();

  for (int i = 0; i < 128; i++) {
    //sum[i] += (fft.spectrum[i] - sum[i]) * smoothingFactor;
    sum[i] = fft.spectrum[i];
    rect(i*4, height, 4, -sum[i]*height);
  }
}