This is at the front of the Great with the expression shades behind us, directly in front of us in the Gemshorn and Celeste, as well as the Hohl flute.
click for detail
Here we see the "Do it yourself mixture" chest. These are all the Great mutation ranks starting with the 2 2/3', working through the 1'
This
is a view from the rear of the Great looking toward the shades. The short wooden rank is
the great Bourdon (Tibia Minor), and the taller wooden rank is the Doppel Flute.
Here is a view from above the Great reeds, the chest off to the left is the top few octaves of the Pedal Bombarde.