Writing on the rear wall of the chamber reads as follows:

             Kilgen . Unit
             Chapel . Organ          
          Installed . May, 1930.
            Balcom . Provorse
            Organ . Engineers
          Frank . Rasor . asst.
              Warren . Webb

Four ranks are: V D Orch, Flute, Aeoline, & Vox Humana.

Flute and Aeoline have white stoptabs. 
Vox Humana has red stoptabs. 
V D Orch/Salic has blue stoptabs. 

And the Mayland chimes and Koehler Lieblich Harp (2') have amber stoptabs. 

The tremolo is located in the basement and is rather ineffectual