This is a silly question, but it seems like the type of thing Craig Anderton could describe how to roll your own Aural Exciter. What do you think the mean by frequency dependent phase?
Could a combination of Buses, EQs and tube plug ins do a fair job of faking it?
So the two buses would be phase inverted with differing eq settings and tube plugs.
Those two busses go to another bus. Since they are exactly phase flipped, everything except the different tube harmonics should cancel (maybe?). Now, apply EQ to reduce the harmonics except in the ranges you want.
So depending on your eq settings in the first 2 busses, the harmonics will be phase flipped by frequency. As they move higher and lower, they will flip phase.
This is kinda a lot of work to get a sound, but it is free to try it.
http://en.wikipedia.org/wiki/Aphex_Systems Based on this article there is some sort of delay as well side chain compression (?) to reduce the volume when there is more bass and boost it when there is less.