The second Preludium by Kellner, transcribed from manuscript Mus.ms. 11544 owned by the Staatsbibliothek zu Berlin. That manuscript has, I think, a bar missing. Bar 27 in the score (below) is substituted by me; omit it if you want to play the version as it is in the manuscript.
The recording was done the sampleset, made by Organ Art Media, of the Arp Schnitger organ in Steinkirchen. I didn’t want to use the extended version, so I substituted the high e in the pedal part of bar 40 by hand on the manual.
The video recording was done with the Hauptwerk software and the sampleset, made by Voxus, of the Matthijs van Deventer-orgel in the Grote Kerk, Nijkerk (https://www.voxusorgans.com/en/product/nijkerk).
Prelude C gr t, FecK 5.1