The is a scientifically grounded system for vocal training that deconstructs the complex process of singing and speaking into the control of specific anatomical structures. Developed by Jo Estill in 1988, the model uses a "Power-Source-Filter" framework to provide singers, actors, and speech therapists with conscious, predictable control over their vocal instruments. Core Concepts of the Estill Model

Once a singer masters the Figures, they can combine them to create distinct "recipes" for sound. The Estill model defines six distinct voice qualities:

Estill Voice International sells digital downloads of their iconic wall charts and pocket guides. These are high-quality PDFs for printing. They include: