Hi everyone. I have a basic question about the biomechanics of speech. If this is already answered please direct me to the solution. I'm trying to determine the main factors which determine the volume of a voice. What I think I know: when a human produces sound, air is forced out of lungs and hits various parts of the vocal passage causing them to vibrate and produce sound. Intuitively, I originally thought to increase volume, I simply needed to increase energy, and thus increase the speed the air by exhaling faster. While this does work. I know there are ways to increase volume without increasing the speed of exhale. I'd like to know how these mechanisms would work. Any thoughts?