Hello JohnZ, in the "Allgemeine Militär Zeitung Jahrgang 2" (General Military Newspaper) from 1827 it is written:
Each Artillerie regiment consists of a Oberstab, a Unterstab and 10 companies. To the Oberstab do belong 1 colonel, 1 LtCol., 1 Mj and the Adjudant; To the Unterstab do belong 1 Adjudant, 1 Quartiermeister, 1 Feldprediger, 1 Oberarzt, 1 Tanbour and 2 Pfeiffer.
As said, from 1827, but I think it is somehow comparable. Btw it is the first time I have heard the term of "Unterstab".
Regards,

wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.