I'd like to preface this with the face I do not know anything about Logic 7, either the HK or Lexicon implementation. But I assume they derive matrix channels out of material of 2.0 channels or more and as such, are not the equivalents of true discrete systems like DD 5.1 or DTS 5.1/6.1. Lately, there is alot of talk about what the extended surround formats represent, most of it somewhat confused. So whose at fault here? The general public and their penchant for misinterpretation or the mfg's who are always trying to pretend they've created something they have not? I'd say both are culpable, but at least the mfg's can do something to mitigate some of the errors seen on both sides; Stop misrepresenting 6.1 channels as 7.1 channels. It's 6.1 channels and 7.1 speakers! Right now, there is NOTHING beyond 6.1 channels. The 7th or 70th channel is either an added channel that is mono combined with the 6th channel or some de-correlated channel courtesy of THX ULTRA 2 that is still NOT directional. Anyone can have extra channels if they want to pretend extra speakers are extra channels. Just add them in parallel with your regular speakers! You want a "pseudo THX Ultra 2 7th channel effect?" Just reverse the leads between those two rear speakers and you end up with a crude 20+ year old surround technique developed by Hafler. What those 2 rear speakers give you is something that's used in movie theatres to afford full seat sound coverage but something that is RARELY needed in home theaters of normal size. The only compelling argument for using the extra rear speaker seems to be to prevent a Dolby Pro-Logic design shortcoming that causes collapse of the left and right surrounds into the rear channel. Using two speakers helps minimize the effect of this problem. One day, someone, maybe Sony with SDDS will produce a TRUE multichannel environment that goes beyond DTS ES Discrete, and it will provide 8 or more channels of purely discrete sound, complete with correct panning and cues! That day has not come. Till then we will simply be bombarded with more "modes" that only approximate true, discrete and directional surround sound.