This same sound can now be duplicated with the new Eventide Tverb, which consists of three completely independent reverbs with compression, selectable polar patterns on microphone 1 and adjustable gates on microphones 2 and 3.
What's more, the original effect was mono due to track limitations, but Tverb provides it in true stereo. The use of stereo microphones enhances the effect and DAW automation can be used to program the microphones to wander around the hall as the track plays.
Tverb consists of a variety of parameters, like 2 moveable microphones to adjust reverb size and tone, a custom Eventide reverb algorithm with EQ, diffusion, and decay control, 2 linkable post-reverb gate modules with control of when the gates close, the speed at which they close and the length of time they are forced to stay open. Signal inversion buttons are also available to remove (or create) phase cancellation, and a Mix Lock allows for scrolling through presets or settings while keeping the wet/dry mix constant.
The user interface is based on a "console" that was inspired by the one used in the session and is complete with Visconti’s "grease pencil" labelling, and provides post-reverb channel processing for each individual mic and the master. The room mixer module alters the sound of the room itself with control over decay, diffusion and frequency attenuation.
The Eventide Tverb is normally priced at $249 but currently has an introductory price of $149. A fully functioning 30 day demo version is also available. The plugin is available in AAX, VST and AU versions that work on most DAWs.