I think everyone is making this whole idea of Super MIDI Tracks more confusing then it is.The way PG made styles in the past was to record midi parts BUT they were limited to 2 bars in length so they would record MANY of these 2 bars phrases and let the program string them together.We have all learned and should know that musical phrase are commonly more then 2 bars long. This became apparent with RTs. Not only are the RTs better sounding instruments but they have longer phrases. So now the Super MIDI tracks.They're sort of a hybrid.They are just MIDI parts strung together like the old MIDI parts but they have longer phrasing like the RTs have.BTW they've been doing this with MIDI drums for quite a few years now.If I was a betting man I make a big bet that when PG gets the guys/gals together to make RTs parts those instruments also have some sort of midi interface on them as well.Killing 2 birds with one stone.I bet if you look and listen to the the super midi parts you'll find the exact same RT.
Hope this helps.Oh one last thing. It doesn't matter how good the Super MIDI part is. If your sound module sucks the part will suck.

John
ESI Gigaport HD+
Lenovo Turion II /4 Gig Ram/ Win7x64 be
15.6" Monitor
"The only Band is a Real Band"
www.wintertexaninfo.com/BANDS/JohnnyD.php