The last piece from the "Harmonische Seelenlust" that was composed by Kauffmann is a prelude to "Ach Gott und Herr". Obviously not meant as a grande finale to the collection, it is (again) a relatively simple fuga on the first notes of the chorale melody. The last entry of the fugato theme is marked with "Ped." in the original edition of the "Harmonische Seelenlust".
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-ach-gott-und-herr