task music()
{
  while (true)
  {
    PlayTone(262,40);  Wait(50);
    PlayTone(294,40);  Wait(50);
    PlayTone(330,40);  Wait(50);
    PlayTone(294,40);  Wait(50);
  }
}

task main()
{
  start music;
  while(true)
  {
    OnFwd(OUT_A+OUT_B); Wait(300);
    OnRev(OUT_A+OUT_B); Wait(300);
  }
}