Kauffmann wrote two preludes on Nun danket alle Gott. They are both manualiter, well worked out pieces. The second one has the melody in the soprano voice, richly adorned with fluent sixteenth notes. The left hand accompanies with static chords. The registration is according to Kauffmann prescription. Note that the left hand uses both a principal and a gedackt.
The recording was done with the Hauptwerk software and the sampleset, made by Voxus, of the Müller organ in the Sint Bavokerk, Haarlem (http://www.voxusorgans.com/en/product/haarlem).
Score available here: http://partitura.org/index.php/georg-friedrich-kauffmann-nun-danket-alle-gott-alio-modo/