This special sound is used in many Silva Mental Exercises. Play it while meditating with the Silva techniques or simply to drift off to sleep.
Delta sound ticks at between 0-4 beats per second. It is used to help your brain frequency slow down towards a passive, deep and calm inner state associated with the theta frequency. At this deep inner state old memories and experiences can be triggered as well as intuitive impressions and hypnagogic dreams.
1 ticks per second, experienced in delta, helps the brain frequency go even deeper allowing for easy entry to a sleeping state.