A little backgrond to this manuscript: The Lynar manuscripts were preserved in the holdings of the Duke of Lynar in Lübbenau, and are therefore also known as the Lübbenauer Orgeltabulaturen. Two of them, large codices in staff notation, bear the designation Lynar A1 and A2. The eleven disparate fascicles in German organ tablature bear the designation B1 to B11. The B-collection represents the most comprehensive source of works by North German composers who were students of Sweelinck.
The seventh manuscript in the B-series contains 5 anonymous choral preludes/variations to Psalms plus a variation on "Erhalt uns Herr". As Psalms were and are widely sung in the protestant churches in the Netherlands, this fits with the supposition that the composer or composers must have been student(s) of Sweelinck. Which one(s) is not known. The works themselves are of high quality.
I'll publish the scores of these compositions somewhere early next year. So this is a sort of a sneak preview of what is to come