A very nice transcription of this Siciliano, made by Arno Rog. He kindly gave permission to make his transcription available on this website.
The recording was done with the sampleset, made by Organ Art Media, of the Arp Schnitger organ in Steinkirchen.
Clicking the above link opens a new tab where you can listen to a recording of this piece. Clicking the play button is free for you and earns me a little money (around 1 dollarcent). If you like my efforts of creating and publishing scores, I invite you to click the button and stream the recording.