ELECTRONIC ORGAN WHEREIN MUSICAL SOUNDS AND A TREMOLO EFFECT ARE PROVIDED BY ELECTRO-OPTICAL APPARATUS

摘要

An organ of the type which utilizes an optical disc record with tracks that control the passage of light from a light source to photocells to create musical sounds, wherein the disc also has a synchronizing track to indicate the beginning of musical measures on certain music tracks and a tremolo track for creating a tremolo effect. A light-transmitting conduit has one end positioned to pick up light passing through the synchronizing track and an opposite end facing a musician seated at the organ keyboard, to provide a flash of light which can be seen by the musician at the beginning of each measure of certain musical tracks. A resistance photocell is positioned opposite the tremolo track and is connected between the photocells of the music track and the organ speaker, to provide a rapid variation in the volume of music.