I've used the amazing Klapmeyer-organ, Altenbruch. I have the semi-dry version, so I've added some native reverb from Hauptwerk V. I've tried to add not too much of it, so that you still recognize the specific voicing of this amazing organ.
In the praeambulum I use the Kromhorn 8' and in the fugue I put the Sexquialtera II into the mixer.