So, was "soup" ever a acronym for something?

No. I'm not sure who used the word first for Empegs, but whoever it was nicked the word from the Apple Newton, which used it to mean the internal free-form database: something given structure only by the various indexes into it. The Sonicblue Tigard boyz who did the Rio portables called the same feature Rio LogiTrack (TM). I think we should call ours Rio TheObviousWayOfDoingIt (TM).

Peter