Liszt: Variations on a theme of Bach "Weinen, Klagen, Sorgen, Zagen" -- going down

I am happy to come back to the project of variations. Between Mendelssohn and Franck, there is a variation by Liszt, I read somewhere. A chromatic melody in this variation was used in the fugue. This melody sounds as if dry fallen leaves are rotating aimlessly in the wind. In Franck's version, he tries to describe the state of mind and to lead it to the verge of histeria. This gives an additional tantalizing effect. I assumed a text of the variation as follows. The music starts with a overture mimicking the colorless organ ceremony in church (bass, going down, is important); Liszt has lost his daughter. He knows she is not there and tries to find her somewhere else underground and follows a devil's guidance. It gives desperate adventures and he fails to penetrate the land of dead. He wanders around the world between the live and dead in the dark being at a loss what to do. At last a dawn comes with a subtly audible hymn. Suddenly glaring light comes upon him and he understands that his daughter is beside God. I told this story to my daughter. She liked it and wanted more explanation at each variation. Here Franz and Devil go through underground volcano, here they lost bodily shape and they are now just spirits, here God scolds Franz to go away, and so on. This piece requires solid mechanical technique and, most of all, concentration and compassion. I do not have any of them, so I cannot play this live before audience. Please listen to the dramatic effect of hymn part and coda. Even if you have fallen asleep before that and surprised with the sudden fortissimo, you might want to check the whole piece again just because of the last part. This is vintage Liszt. How did Franck find his own voice knowing the great works by Bach (I will play one), Mendelssohn (I have to play his Fugue also), and Liszt? #This piece is on a theme by Bach, but I somehow am more familiar to Nielsen's (or Franck's?) string quartet. Maybe I picked up from radio programs more than 20 years ago.

#I mostly (tried to) follow Cortot edition. This version indicates sophisticated ups and downs helping the phrasings. A great reference for self-learners.