Thank you Robert, for listening and for the informations about the preludes!
Yes, it is a great feel to play on such an organ with much ranks. It has an electronic setting possibility to program which registers should be drawn. So through the piece, one can press the next button with a feet or finger to come to the next presetting. Nethertheless one needs to concentrate - I used all three manuals, needed to turn the pages myself and pushed the preset buttons every new section. For the very last chord I could not resist and pushed the "tutti" button - that means, ALL registers and all couplers were drawn - an hour with that and one gets deaf ...
For me, this "stylus phantasticus" can be found also in the well-known Bach toccata&fugue d minor (whoms authorship is doubtful). I think Buxtehude deserves much more attention, because some of the preludes sound really great. This year is a special Buxtehude year, because he died 300 years ago, maybe that helps to raise his popularity - some complete editions of his works are planned or released now.
The Link above does not work (there is an additional /sheet directoy in the link), so the following link should work:
http://server3.pianosociety.com/protect ... chmidt.mp3