The article discusses different registers of the organ found in St. Jacobi, including the Octava 8′, Quintaden 8′, Rohrflöth 4′, Querpfeiff 2′, Bahrpfeiff 8′, Trommet 8′, Plenum, and Cimbelstern. Each register has unique characteristics and historical significance, with different builders like Arp Schnitger and Jürgen Ahrend contributing to the construction. The Plenum is highlighted as the collective sound of the principal registers, forming the backbone of the organ’s sound. The Cimbelstern is a mechanical plaything that adds a unique touch to the organ. The article also credits various individuals for the concept, recording, programming, and design.
https://www.orgelstadt-hamburg.de/play-arp/