There's also the roomy vocal trick on "Heroes", that Visconti created by using 3 microphones - one close up, one in the middle of the room, and one at the back of the room. The far microphones were gated at different levels though, and only opened when Bowie sang loud enough to open the gate and allow the room mics to be mixed in. Visconti discusses it here, and there's an emulation of the effect in the Eventide T-Verb plugin, using impulse responses of Hansa Studios where it was recorded in the Meistersaal:

https://youtu.be/7Q2scPrc1WE?t=737