I'm pleased to be recording this piece on the newly released Mátyás II sample set (Inspired Acoustics). It's a 110-stop 1909/1984 Rieger-Kloss symphonic organ of the Notre Dame of Buda (Matthias Church), Budapest, Hungary. For further information, please visit the page here: https://www.inspiredacoustics.com/en/products/matyas2
For the Hauptwerk enthusiasts out there, I have loaded this in 24-bit quality with samples truncated to 250ms and have applied both the supplied reverb files (close/distant) to achieve this glorious sound.