I thought it a nice idea to also play it twice, on the Altenbruch sample set and again on the Groningen sample set. So we can compare the same piece on the same organ with different registrations and on two different dryish sample sets.
I already uploaded the first movement, and here's my go at the second movement.
The Adagio of the first Sonata consists of the halves that are to be repeated. To emphasis the fact that the melodic lines of the parts of the hands are written so they can switch position, I thought it a nice idea to let my hands switch manuals on the repeat of each halve. Which was indeed a nice idea but a bit awkward to carry out. For the upper manual I had chosen a registration on a 4 foot basis. Meaning that I have to play an octave lower on that manual than the music is written to get the pitch the composer meant. As long as the left hand plays on that manual that's not a problem. In the repeat however I play the right hand part on that manual with the result that sometimes my right had is at the lower end of that manual while my left hand is at the upper part of the other manual.
The video contains both recordings. First the Altenbrich sample set, then, at 9'55'', the Groningen sample set.