Abstract: The control system of the present invention is particularly usable with extended vibration conveyors and permits the installation of a multiple of drive vibratory drive units comprised of one or more vibratroy modules. Each module comprises a motor, one or more shafts mounting eccentric weights, and a shaft encoder device monitoring the "relative position" of each shaft with respect for each shaft. One shaft, a master shaft, is driven continuously driven at a predetermined speed from which the actual relative positions are compared.