import processing.sound.*;

SinOsc sine;
int index = 0;
float t = 0;

void setup() {
  size(640, 360);
  background(255);
  sine = new SinOsc(this);
  sine.play();
}

void draw() {
  float n = noise(t);
  sine.freq(map(n, 0, 1, 100, 1000));  
  t += 0.005;
}