Soundlessness is complete. You cannot do anything more to make it more soundless. Understand this: it is complete, nothing can be done. You have come to a point beyond which there is no movement possible. And if a sound is total you cannot add anything to it. You have come to another limit; you cannot go beyond it.
One can say it is soundlessness because no sound is heard, everything has become absent. You cannot take anything further from it; it is complete. Or you can say it is a complete sound, a full sound, absolute sound; nothing can be added to it. But in both the cases the indication is for perfection, absoluteness, wholeness.
