Fuga supra Prelude Grafhorst

I worked on it for a long time, now it is finished - the Fuga on the beautiful theme of the Prelude Grafhorst by Jean-Paul. It really is a wonderful, powerful theme that is even self-similar and therefore very well suited for a fugue, but more about that later.
In one way or another, the theme tempted me to modulate strongly, so that already in the 2-part interlude the action jumps through the entire circle of fifths, and gravity pulls everything into the dark keys, so that in the development we move very, very far away from the home key - a tour de force, finally, to go back from F minor to D minor for the concluding coda, in which the theme sounds simultaneously, in different time measures, and so in bar 90 et seq. thus impressively documenting the self-similarity of the melody - so much for the excursion into fractal theory - music is higher mathematics after all - isn't it?
I hope that you, Jean-Paul, in particular, enjoy the work!
Now enjoy the Melcer Chamber Music Hall organ, which impressively demonstrates in the final section that, as a little sister to the large 55-stop organ of the Concert Hall of the Frederic Chopin Academy of Music in Warsaw, it certainly offers competition.