Studer Vista 1 Operating Instructions Manual page 161

Vista 1 Digital Mixing System
Here are the placements for some of the Panner Mode presets:
oRTF (With surrounds)
The amplitudes vary due to the directionality of the microphones, while time
delay is varied based on the distances between the microphones (each of them
feeding a speaker).
aB (With surrounds)
Because all microphones are omni-directional, the amplitude is the same
for all of them, but the delay differs due to the distances between the micro-
phones.
sphere
The Sphere setting is based on a microphone as shown in the picture above.
Amplitude, phase and frequency response is calculated based on measured
signals from such a microphone.
Parameters 3-49
Document generated: 18.04.17 SW V5.3