It is easiest to think of the 3 modifying parameters to imager in terms of a pair of microphones setup facing each other at a 90 degree angle as in a blumlein stereo recording.
thinking in this manner, imager can be used to change the orientation of the microphones after the recording has been made by tweaking the parameters thusly:
direction in which to "zoom"
zoom adjusts the "angle" of the microphones, where:
-1 points the microphones fully towards eachother,
resulting in a mono sound +-90 degrees from the zoom "direction
+1 puts both microphones pointing in the set zoom "direction",
resulting in a mono sound
rotation "turns" the microphone stand
Freeware by Sonomatics