No prior theory of edgetones has been able to predict the data of basic experiments. In this paper it is assumed that the edgetone acoustic oscillator is just another feedback oscillator that can be explained in a manner closely analogous to how ordinary electronic feedback oscillators are explained. The basic phenomenology of edgetones seems simple. A tone is produced when a jet of fluid from an aperture is blown against an edge. The jet and aperture-edge system are immersed in a surrounding fluid.
Oscillations occur in both liquids and gases.