int n=200;
int soundLength = 20000;
boolean toggle=false;

BSound beep1,beep2;
int lastToggleTime;

void setup()
{
  size(400,400);

  beep1 = new BSound(soundLength);
  beep2 = new BSound(soundLength);

  generateSound();

  //  repeat(beep1);

  lastToggleTime = millis();
}

void drawSquare()
{
/*
  noStroke();

  float x = (int)(random(1.3));
  float y = (int)(random(1.3));

  fill(100,100,200,50);
  rect(400,10,20,20);
*/
}

void loop()
{
  int currentTime = millis();

  if (currentTime-lastToggleTime > (int)((float)soundLength/8000.0)*1000)
  {
    lastToggleTime=millis();

    if (toggle) toggle=false;
    else toggle=true;

    if (toggle)
    {
      stop(beep1);
      play(beep1);
      background(0);
    }
    else
    {
      stop(beep2);
      play(beep2);
      background(90);
    }

    drawSquare();
    generateSound();

  }

}

void generateSound()
{

  float p0 = random(1.0) * 1.0f;
  float p1 = random(1.0) * 1.0f;
  float p2 = random(1.0) * 1.0f;
  float p3 = random(1.0) * 1.0f;

  float freq1 = random(1.0) * 60.0f;
  float freq2 = random(1.0) * 60.0f;
  float freq3 = random(1.0) * 60.0f;

  int funca = (int)random(2.9f);
  int funcb = (int)random(2.9f);
  int funcc = (int)random(2.9f);

  for (int i = 0; i < soundLength; i++) {
    // fill the sound with a sine wave

    int v=0;

    float a = function(funca,i/freq1, p0, p1);
    float b = function(funcb,i/freq2, p2, p3);

    // Fade out:
    float vol = cos(((float)i/(float)soundLength)*(PI/2.0f));

    v = int(127 * function(funcc,i/freq3, a, b) * vol);

    if (toggle) beep2.samples[i] = v;
    else beep1.samples[i] = v;
  }
}

float function(int func, float p, float a, float b)
{
  if (func==0)
  return func01(p,a,b);
  else if (func==1)
  return func02(p,a,b);
  else if (func==2)
  return func02(p,a,b);

  return(0.0f);
}

float func01(float p, float a, float b)
{
  return sin((p*a)+(b*PI*0.1f));
}

float func02(float p, float a, float b)
{
  float v=func01(p,a,b)*2000.0f;
  if (v<-1.0f) v=-1.0f;
  if (v>1.0f) v=1.0f;
  return v;
}

float func03(float p, float a, float b)
{
  return (float)((p%100)-50)/50.0f;
}