Did simply turning the microphone around solve my tracking issue?
This is also a demonstration of retinal rivalry from reflections, which can be observed in the four microphones, and can be experienced in reality as well as in stereoscopic virtual reality.
Also uploaded to Facebook. Viewable in 2D, 3D and 360° virtual reality.
Created with Blender, Sony Movie Studio Platinum 13, Reaper and FFmpeg.
Zoom H2n Handy Recorder:
Whoopee Cushion 2 Pack: