This is not as helpful as I meant, but let me give a try. I have vol. 4
and 5 (CDs) from what seems to be a traversal of Buxtehude's complete works
for organ, played on a marvelously sounding Schnitger instrument; the label
is, I think, Harmonic Records. It seems to have been deleted a long time
ago. I don't recall who's the performer. I'd love to get hold of the
rest, but I never saw them anywhere.
-Margaret Mikulska