After Kellner's Praeludium in C I often have the feeling there must come something after it. I found a fugue in C by Kellner, which combines pretty well with the praeludium. The chromatics, the intervals C-(E-)G.
Both pieces have the same spirit, which is in my opinion: joyful, humorous, witty and certainly not too serious...
The tempo may be an issue to some, certainly combined with the big acoustics of the Nagold church. No, I didn't have to catch my train :)
The sheet music is in the attachments. I used another edition, which differs slightly from these editions by Pierre Gouin.