Wer nur den lieben Gott lässt walten, op. 52 nr 39

Otto Dienel was organist in Marienkirche in Berlin. The organ in that church was build in 1720 - 1723, adapted in 1800, restored in 1829, and enlarged and adapted in 1893. So it was in origin a Baroque organ, suffered some changes in the classical period and was again changed in the Romantic period. And the sound was probably a mix of all those styles and periods. And that was the instrument Dienel wrote his music for.

Did he write with a Romantic sound esthetics in mind or was his musical imagination influenced with the (possibly) Baroque sounds of his organ? Did he write music for his own organ, or did he write music wishing he had a newly build Sauer at his disposal?

If I want to play music composed by Dienel, what type of sample set should I choose? German Baroque, Classical, or Romantic? And which one of the possible sample sets from all those time periods? Even if there were a sample set of the organ of the Marienkirche in Berlin, it would be a sample set of how it sounded today (after the enlargement of Sauer in 1908, and the various restorations in 1957, 1970, 1985 and 1999) and not of how it sounded in the days of Dienel. So, I do what every organist of every time always does: adapt the music to the organ at hand. The organ of the Martini church in Groningen is Renaisance in origin and given it's present shape mainly by the famous (Baroque) organ builder Arp Schnitter. How does German Romantic music sound when played on a Dutch Renaisance/Baroque organ and is it 'right' to play such music on such an instrument?

I play the accompaniment with the Salicet 8' of the Hoofdwerk and the choral melody with the octaav 4', played one octave down.