Some of the sounds, like Planewind sound, are boosted too much. In other words, peeks that go out of the dynamic range.
Lockon accelerates and decelerates sounds as you flyby and when your soundfile contains peeks that go out of the dynamic range, you hear cracks.
Some of the original sounds of Lockon also suffer from this, in fact many original sounds are in bad quality, no matter if they are wav or ogg.