Include the natural reverberation of the church or cathedral where the organ is located.
Historically, a top-tier sample set like the Armley Schulze or Zwolle requires 32GB to 64GB of RAM and a robust SSD. That is fine for a studio PC, but a nightmare for a touring artist with a MacBook Pro. hauptwerk organ sample sets portable
Traditionally, Hauptwerk required a massive four-manual console and a heavy server rack. However, recent hardware advancements have made "portable" setups a reality for touring concert artists and home enthusiasts with limited space. Include the natural reverberation of the church or