The advanced real-time computing technology used in Sanus digital organs was developed by Eminent Orgelbouw in 1990. With this real-time tone generation system, it is possible to voice organ sounds according to the acoustical nature of each individual location. This is actualized through the “real-time” volume control of the individual fundamental and partial harmonics, which are made accessible for every stop sound.

As with all pipe organs, air goes into a specific pipe when a key is pressed. In the first fraction of a second of this action, the air pressure is somewhat higher and causes pipe harmonics to develop, resulting into a sound (attack) that is heard shortly. Once the air column has stabilized, only the “steady” state sound (main) is heard. The Sanus real-time system is akin to the pipe organ sound generation system. For each Sanus stop sound, there are two constituent sound parameters – Sound A (main) and Sound B (attack). The harmonic structure of these parameters (main and attack) are accessible and editable, likewise the attack and decay times for these constituent sound parameters.

With the Sanus system, a type of additive synthesis, organ voicing is therefore not restricted to the simple adjustment of the relative volume of notes, chorus, tremulant (speed and depth), wind pressure and treble-bass equalization as with sampled-sound organs. There is the facility to voice at an actual harmonic level, making it possible to change or edit the character (timbre) of the stop sound itself, register by register.