The missing piece of technology that prevented the audio production industry from using the electrical recording system earlier was a device that could the electric signal.
The lack of technology that historically prevented sound processing from using an electromagnetic recording system, that has a device capable of codifying electrical impulses.
Its Diaphragm has been the device, that made it all possible.
It is large, melodically but constantly expanding dome-shaped muscle and often unintense.
It expands while straightens as well as the cavity of the chest extends during inhalation.