Kauffmann's prelude to "Herr Jesu Christ, ich schrei zu dir" is a relatively simple three part piece. The choral melody is in the upper voice. The other two voices provide an accompaniment based on short fragments of the chorale melody. Kauffmann prescribes a simple 8', 4', 2' registration for this piece, that I ignore in my performance. The piece is written in such a way that it is possible to play the choral melody with the right hand and play the accompaniment with the left hand on another manual. And so I did...