After a discussion about the Images versions of tracks on another thread, I was reminded of something I off-handedly noticed some time ago: namely, how the main Eminent strings of Equinoxe 4 are played on a different synth in the Images version for example (D50, maybe?).
Which further made me wonder: was the E4 lead instrument changed to a different one (a more generic, but not quite, piano sound) around the same time as well?
Comparing the original album version to the Hong Kong one, for example, sort of sounds like it had switched to a different instrument... and at the same time to my ears it also sounds like it's still just the Eminent one with effects added in (or changes to the ADSR values).
Notably, by the "analog revival" of the 2007-2011 tours, the lead instrument once again has reverted back to the original Eminent plucks.