O Lamm Gottes, unschuldig, BWV 618

Johann Sebastian Bach's chorale prelude on the Passion hymn 'O Lamm Gottes, unschuldig', BWV 618 is part of the Orgelbüchlein. Despite the sad character of the text, it's rather optimistic (comparable to the Neumeister setting by Bach on this piece). The cantus firmus appears both in the pedals as in the alto part of the manuals (a quint higher). I've picked a mild registration, which gives a good enough balance to hear the canon.

I've heard a dozen of different tempi by very good organists, from very fast to very slow. My tempo is on the fast side, but I prefered to have a natural flow in the piece (well, at least to my ears).