Processing: Input audio and draw colorilze wave

gistfile1.c

import ddf.minim.*;

Minim minim;
AudioInput in;

float data;

int[] col = new int[8];
float angle = 0.0;
float offsetAngle = PI / 3;

void setup(){
  size(512,400);
  minim = new Minim(this);
  minim.debugOn();
  in = minim.getLineIn(Minim.MONO, 512);
  frameRate(60);
}

void draw(){
  background(0,0,0);
  int len = in.bufferSize();
  int w = 1;
  int rCol = 128 + round(sin(angle) * 128);
  int gCol = 128 + round(sin(angle + offsetAngle) * 128);
  int bCol = 128 + round(sin(angle + offsetAngle * 2) * 128);
  for(int i = 0; i < len; i++)
  {
    data = in.mix.get(i);
    float h = data * 200;
    
    stroke(rCol, gCol, bCol);
    line(i, 200, i, 200 + h);
  }
  angle += 0.05;
}