The second chorale prelude by (presumebly) Christian Geist in the Uppsala manuscript uses the melody Wolfgang Dachstein wrote for “Aus tiefer Not schrei ich zu Dir”. It is a fine example of the Northern German organ style. If anyone would have told me it was written by Buxtehude, I would probably have believed him.
In the score I made a few alterations that are not in the manuscript. The manuscript seems to me like a transcription itself of an older source. It contains some errors that are already corrected in the manuscript (for example pedal part of bar 17). But perhaps it contains a few other errors as well. It’s tricky to deviate from one’s source, but I choose to do it anyway, in the cases I think to be errors in the manuscript. I indicated my alterations in the score, so anyone can play what is written in the manuscript.