Guturals are Slate VCC -> aggressive hi/lowpass -> parallel distortion -> a slight dip at 2.5 k to remove ear bleeding blended to taste with lead vox (VCC -> quite a lot of highs dialed in -> 1176 style comp with attack at noon, release fastest setting).*
Then both routed to a buss with further compression and a limiter to shave off occasional peaks and automated to fit in with the orchestra.*
Two aux busses; one a reverb track with the Bricasti Studio B true stereo ir by Samplicity with everything cut away below 200 Hz. The second aux is my special vox widening trick (well afaik it was Pensado who came up with it).
You take a stereo delay with a bit of modulation and all that hi/lowpass yada yada. Then you need some MS-processing tool and take away all the center information. You may have to flip phase on this track, whatever sounds best as usual.
The guitar sound is taylored not to fuck with the mix as far as possible, quite drastic filtering on them. Also the cab was mic'ed from 5-6" away which isn't really the tone most of you guys are used to, but I found it to be a solid compromise between space occupied in the mix and still being heard with that infernal orchestra blaring all the time.*
Mixing time was 4-5 hrs with an additional hour for reamps.*
It was quite a fun to try and solve this jig-saw puzzle, pues gracias por la oportunidad, manos.
EDIT: Just for shits and giggles I did another version with a more upfront, widerange-y guitar sound. IMO it sits a lot worse with the brass instruments. Due to loudness I was forced to use my Blackstar Blackfire into Two-Notes Torpedo PI on this (can't crank my Krank on a Sunday afternoon).
http://dl.dropbox.com/u/44862070/circum me ira master blackstar.mp3