One of the two preludes Buxtehude wrote on the melody of "Herr Christ, der einig Gottes Sohn". It is written in his usual style, with a colourfull solo voice, playing the choral melody with lots of embellishments, and a artful accompaniment. The recording was done with the Hauptwerk software and the sample set of the Mascioni of the parisch church in Azzio, made by Piotr Gabrowsky. Free score available here: http://partitura.org/index.php/dietrich-buxtehude-herr-christ-der-einig-gottes-sohn-buxwv-192/