Another one of the pieces from the organbook of Matthias Rottenau (Mus. Ms. 40615 from the Staatsbibliothek zu Berlin) that is probably possibly perhaps a Ricercar. The manuscript contains, I think, some errors in this piece. Unlikely dissonants that are more likely caused by a transcription error than that they are intentional. As usual I indicate these editorial choices in the score, so anyone can choose to play the notes as they are in the manuscript, or as they are in my edition.
Score available here: http://partitura.org/index.php/anonymus-ricercar-primi-toni-2/