Where's the fire, Fritz?

Here's a fascinating oddity from recording history: organist Fritz Heitmann at the Sauer organ of the Berlin Cathedral in 1940 playing the J.S. Bach Toccata in d-dorian.  This has been digitized from an old 78 recording.  What sticks out most about this performance is the break neck tempo Heitmann takes on the Dorian, especially within such a vast space as the Berlin Cathedral and at the reigns of such a massive instrument as the Sauer organ.  The Dorian is so complex, and at this speed, the intertwining texture of the voices is so muddied, much of the detail is lost, sadly, especially towards the end.  I would assume much of this is thanks to the recording quality of the 78. But musical critique aside, this is an intriguing historical recording.  Not many years after this performance, the voice of this giant instrument was silenced for decades after the cathedral suffered severe damage as allied bombs ripped through the dome in the nave.  Restoration work to the instrument begain in the 1980's and was completed after German reunification.