Johann Michael Bach's prelude to "Dies sind die heil'gen zehn Gebot" is a four part piece that was probably meant to be played manualiter. Each phrase of the chorale melody is introduced with a little fore imitation in two of the other voices.
The recording was done with the Hauptwerk software and the sample set of the Vermeulen organ of Sts. Simon and Jude Thaddeus Apostles Church in Raszczyce by Piotr Gabrowsky (http://www.piotrgrabowski.pl/raszczyce.html)
Score available here: http://partitura.org/index.php/johann-michael-bach-dies-sind-die-heilgen-zehn-gebot