Sorge's prelude to "Heut triumphiret Gottes Sohn" has an introduction with two voices plus a bass voice. When the choral melody enters, the accompanying textures reduces to one voice and bass voice. Sorge creates and exuberant, triumphant piece, perfect for the choral's text.
The recording was done with the Hauptwerk software and the sample set, made by Voxus, of the Van Dam organ (1832) in Tholen (http://www.voxusorgans.com/en/tholen).
Score available here: http://partitura.org/index.php/georg-andreas-sorge-heut-triumphiret-gottes-sohn