I see this piece as the perfect organ twin of Auschfwung from piano Fantasiestucke op.12, which is in f minor too. It is really Schumann in the genuine exalted Florestan-Eusebius mood of his piano pieces as Humoresque, Kreisleriana, Davidsbundler Tanze and so on (if you agree .....).
Sorry for the use of an Audacity patch :-(.Perhaps I was too exalted when playing....