This video was recorded at the 1858 Keller organ in October 2020. I had started working on the organ sonata in D major H.86/Wq. 70/5 by Carl Philipp Emanuel Bach (1714-1788) at that time and while you need at least two manuals for the first and third movement, the second movement, the Adagio, can be played on one manual. So I made a spontaneous recording during a practice session.