Spatialization:

The raven files (flying overhead and the wing sounds) are spatialized with the TiMax2 Soundhub digital matrix mixer with trajectories of Echo based spatial images simulating symmetric reflections of 171 ms on either side of the source, with reduced amplitudes (which broaden the stereo image to 6 output channels for a stereo pair), using presets such as:

Echo 1

Echo 5

Echo 8

Note: the delays (indicated with small arrows) are set constant at the maximum on each channel to avoid any interpolation of time delays during a trajectory (which would otherwise result in an audible modulation of the signal). In fact, the delays turned out to be unnecessary as their constant value did not produce an echo. For each channel in these diagrams, the pairs of faders control amplitude (left) and time delay (right).