Experience of meditation During meditation stop hearing sounds and going into darken space experience.After that  there is a gap between inspiration and expiration.short breaths.what's it ?
In Zen, we'd call that Mu.  It's a state of blankness or voidness.  The aim of emptiness meditation is to widen that gap.  Eventually it will pervade your entire consciousness, the in breath, the out breath, and even your total body will be awash in that emptiness.  Once you've done that, then the real practice begins!