Ian and others, when you discussing the 2006 and onwards releases verses the 1994/5 and previous versions of the Genesis catalogue. Are you talking about the Stereo only versions?
Nick Davis's word to me was that the Stereo mixes in the 2006 and onwards, where the fold down mixes from the Surround Sound mixes.
The whole Genesis catalogue in the surround format is by example a huge achievement for the fans, but also perhaps one of the first band's to release their entire works in such a format / programme.
The Stereo mixes are never going to be the best representation of the material Genesis have written / recorded, I find such conversations redundant especially when they start going on about compression / mastering etc.
The box set / remixing project was never about the Stereo mixes or the concert / tv era footage of the time, it was always about the Surround mixes and getting them completed and released. The Stereo mixes were contractual through the Record Company.
The previous stereo releases, all have come from reel to reel tape of the copy masters... not the multi track tapes.
Nick confirmed on the old Forum that fold-downs were used for The Platinum Collection. However, Nick also said for the cubed box sets and individual albums, new stereo mixes were created in addition to the 5.1 mixes. For a listening example, if you listen to “Undertow” from The Platinum Collection, and the new stereo mix on ATTWT, you will hear some differences (e.g. the volume of Phil’s harmonies) that are not due to mastering.