Only 6 choral preludes by Hanff’s hand are known. And that is a pity because these 7 are of high quality. The source for this transription of Hanff’s prelude to “Wär Gott nicht mit uns diese Zeit” is the Frankenberg manuscript, written by Johann Gottfried Walther and nowadays in the posession of the Nederlands Muziekinstituut in Den Haag (The Hague, Netherlands). There must be another source for this work, because the Breitkopf edition differs on several points of Walther’s version. Intruiging in Walther’s version is the spot where he writes a bar of 6 quarter notes instead of 4. If this signifies an error on Walther’s part is then perhaps a bit of the original music missing?
The recording was done with the Hauptwerk software and the sampleset, made by Sonus Paradisi, of the Schittger organ in the St. Martini-kerk, Groningen (http://www.sonusparadisi.cz/en/organs/netherlands/groningen-st-martini.html).