Percy Grainger--Electronic Music Pioneer?

"Shortly after these recordings were made, Grainger and Cross embarked on a much more ambitious project, The Electric Eye Tone Tool. This was to have been a seven voiced instrument, with seven sine wave oscillators controlled by variations in light on a series of 14 photocells. Patterns painted on a large plastic sheet pulled across the plate of the instrument caused the variations in light. In this way, Grainger's vision of a graphic notation for precise glides and intervallic leaps could be finally realised. "

(this and much more at th'Apothecary's Drawer Weblog)