Zen Wave | 128 Hz Healing DeviceActivate Your Body's Self Healing Process! The tuning fork is a musical instrument that produces a high frequency sound that is rarely heard elsewhere in the environment. In holistic alternative medicine, this tuning fork has been used to locate bone fractures and to promote healing and energy balance. This 128 Hz fork, in particular, raises nitric oxide, a gas naturally present in our bodies. Nitric oxide has many functions: it acts as a messenger