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This was my mother's practice up to the late 1980's.
Using intuition to locate and visualize problem parts of the body and mind. Then, per the 'feel' of the area, use a tone related that feeling to sing at the focal area, while visualizing a conversion of light image and feel.
Skills required: Hearing your guides. A sense of intuition. A feeling connection to your patient.
Ability to make the sound, with a relaxed 'gutteral' voice. Visualization. Focus. Concentration.