Homeostasis refers to the body's ability to maintain a stable internal environment, despite changes in the external environment. In other words, the ultimate state of ease and balance in the body and mind.
 
The Center for Neuroacoustic Research's website explains that homeostasis is crucial for the survival of all living organisms. The human body, for instance, maintains a constant body temperature of 98.6°F (37°C), which is critical for many physiological processes to function properly.
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There are various physiological systems that work together to maintain homeostasis.
These systems include the nervous system, endocrine system, and immune system,
among others. For example, the nervous system helps regulate heart rate, breathing
rate, and blood pressure to maintain a constant internal environment. Meanwhile, the endocrine system releases hormones that help regulate blood sugar levels and the body's response to stress.
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Your Autonomic Nervous System (ANS) is the seat of the stress handling system and is composed of the Sympathetic and Parasympathetic branches that control the fight or flight survival response (Sympathetic) and the rest and digest response
(Parasympathetic). 
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When neither of these systems is pulling energy from your body’s storehouse, the ANS should be in a state of balance and zero-stress called Homeostasis. This Homeostasis state is necessary for healing, rebuilding of tissues and balancing the general function of all body systems. If the ANS is stuck in the fight or flight mode chronically, healing can be impaired, and all body systems function can therefore also be impaired. 

By monitoring the autonomic nervous system with the real-time heart rate variability
(HRV) system, we can see if this master control system is balanced and functioning
properly. Watching this helps us see if your body's stress handling system is balanced and functioning optimally.

If this master control system is not functioning properly, it can be returned to a balanced function using a precisely tuned sound frequency (your fundamental frequency) - this is the bio-tuning process. By exposing you to this balancing frequency regularly over time, the autonomic nervous system can be retrained back to a balanced function.