The organ pipes produce sound through the effect of air pressure. The air needed for playing the organ is supplied by six blowers that start running when the organ is turned on. The air from the blowers is directed to the bellows, which help maintain a steady air pressure. From the bellows, the air is carried through air ducts to different parts of the large instrument, reaching each pipe section. When the organist presses a key while playing, a valve opens, allowing the airflow into the pipe, causing it to sound.

There are two bellows rooms in the organ, located above and below the visible parts of the instrument. The entire organ, including the bellows, is nearly 20 meters tall.