Augmented Reality in Vocal Technique Training: Interactive Visualizations of Breath and Posture Control Using Magic Keys AR

This study aimed to evaluate the effectiveness of Magic Keys AR as a tool for accelerating vocal learning through synchronized monitoring of breathing, posture, and acoustics. The findings indicate that augmented reality facilitates faster vocal mastery, allowing students to visualize three parameters simultaneously—breathing, posture, and sound. The experiment involved 120 conservatory students aged 18–25 from three Chinese cities, divided into two groups of 60 participants each: the experimental group trained using the Magic Keys AR system, while the control group followed traditional mirror-based instruction. The training lasted 16 weeks. Respiration was measured via plethysmography, body movements were tracked across 37 anatomical points, and voice was recorded in high resolution (96 kHz/24 bit). Students using AR increased phonation duration by 34.1