Sound healing therapy has been used for millennia across the world. Ancient forms of sound healing such as singing bowl meditation have been used in Tibetan and Buddhist cultures. Other ancient comforting sounds include gongs, church bells, wind and rain. Ocean sounds have been written for millennium as a natural sleeping pill. The low frequency of chanting is known to reduce stress, anxiety, and restlessness.

What these ageless techniques and instruments have in common is that their sound spectrum (frequency range) overlaps with the Gamma-band activity (GBA) frequency range, from 30 to 200 Hertz (Hz). The GBA has a role in various cerebral functions such as perception, attention, memory, consciousness, synaptic plasticity, and motor control. 40 Hz GBA is believed to balance the excitatory and inhibitory neural processes in the brain which is important for overall brain function and information processing.

SOUND+THERAPY is a natural sleep solution that replicates ancient sound therapy techniques. It generates custom "beat sounds" with a fundamental frequency of 40 Hz, falling within the lower range of gamma brainwave activity (GBA). It is designed to stay self-calibrated within a range of 0.01 Hz. This frequency has been shown to promote sleep and relaxation. Due to the complexity of producing these custom beat sounds, ASTI sound experts have developed a special proprietary speaker that can generate such a low frequency at an affordable cost.