Sorge's second chorale prelude to "Komm heiuliger Geist, Herre Gott" from manuscript Mus Ms 30376 (Staatsbibliothek Berlin) shows him from another side. No trio like texture, but a four voice fugue, with the first phrase of the chorale melody as fugue theme. Sorge is not the greatest writer of fugues. If it were written for an exam, he would barely pass it, I think. The chorale theme, however is easily recognizable in all it's 9 appearances. It's a bit strange than that the theme doesn't appear in the last 7 bars (almost a quarter of the total length of the piece).
The recording was done with the Hauptwerk software and the sample set, made by Voxus, of the Van Dam organ (1832) in Tholen (http://www.voxusorgans.com/en/tholen).
Score available here: http://partitura.org/index.php/georg-andreas-sorge-komm-heiliger-geist-herre-gott-alio-modo