Note 59 — Chapter VIII
Reading edition
According to Gesner the keyboard of the Rück-positiv (back choir) of the St Thomas’ organ stood apart from the chief organ, and was used by Bach to conduct from (see the frontispiece of Walther’s Lexicon, 1732). If there was an organ obbligato part, it would be played on this manual, while another person played the continuo on the chief organ.