How are the dynamics of the organ changed?

The dynamics of an organ can change due to various factors, including the type of pipes used, the pressure of the air supplied, and the way the keys and stops are manipulated. Different stops allow for varying combinations of timbres and volumes, while changing the air pressure can affect the intensity and richness of the sound. Additionally, the playing technique of the organist, including touch and articulation, can significantly influence the overall dynamics and expressiveness of the performance.