A pipe organ is a musical instrument that produces sound by driving pressurized air through the organ pipes selected from a keyboard called a manual. It is constructed from settled groups of pipes. Each group is composed of similar pipes with the same tone colour and loudness but different pitch. Such a group is called a rank. We have developed two electronic devices for upgrading the organ. The first device named Controller of Register Combinations is intended for storing rank combinations and pipe organ controlling. The second device named Controller of Tone Keys for pipe organ allows users to play the organ simultaneously on two separate keyboards. In this paper, we represent the purpose, scheme, and our realization of both devices. The correct functioning of the devices was proved by integrating them into a church organ. We have already equipped several church organs with our electronics, and they all work flawlessly. Feedback from the organists is excellent, as both Controller of Register Combination and Controller of Tone Keys make it easier for them to play. The success so far and the positive responses of the organists have encouraged us already to plan further improvements and upgrades of the organ electronics.

Keywords : Pipe Organ, Pipe Organ Electronics, Controller of Rank Combinations, Controller of Tone Keys.