Kauffmann's prelude to "Aus tiefer Noth schrei ich zu dir" is largely a manualiter piece. Setup as a fugato on the first phrase of the choral melody, the last entry of the theme is marked with "Ped." in the source. A well writeen unpretentious piece.
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).