EXS24 and Orchestra Jam Pack issue

Question

This is making me crazy: I'm setting up a Logic template to use for orchestral pieces. I'm switching all the instruments to the EXS24 so I can have more control over sample playback, especially restricting instruments to their playable ranges.
Right now, I can use the Mod wheel to swap between different playing styles (legato/staccatto, for example). If I switch to the EXS24, the appropriate samples load automatically and everything works fine. If I go into the EXS24 and change the sample ranges, everything works fine for a while. BUT, when I save my project and reopen it, suddenly the mod wheel has no effect. No sample swapping.
I've checked all the parameters I can find and nothing else has changed. All I've done is change the sample range for the low and high samples. I tried it again with a completely new file and the same thing happened.
Anyone have any ideas? It's really baffling.
(I know that the output for each orchestra instrument has to be Bus 11. Not sure why this is, but it definitely effects the mod wheel function. Maybe this has something to do with it?)
Thanks.

Answer 1

Read the chapter in the "What's New in Logic Pro 7.1.pdf" (7.2), Plugins -> EXS24, that explains this:
"Remapping of Pitch Bend and Modulation Wheel events
In order to create realistic-sounding performances in an easy and intuitive way, the Jam Pack 4 (Symphony Orchestra) Instruments use the modulation wheel to switch between articulations (legato, staccato, and so on) and the pitch bend wheel to change expression (crescendo, diminuendo, and so on). Further information about this can be found in the Jam Pack 4 documentation.
This is achieved by internally remapping pitch bend events to MIDI controller 4 and modulation wheel events to MIDI controller 11. To ensure compatibility with the Jam Pack 4 instruments, the EXS24 mkII now uses this remapping behavior for all instruments that use controller 4 to switch between groups.
Please note that this new remapping model is also valid for user-built instruments. If you use controller 4 to switch between groups, the EXS24 mkII will remap incoming pitch bend and mod wheel events to controller 4 or controller 11, respectively. The default pitch bend and modulation wheel functionality can not be used. If you don’t want to use this remapping model, select a different controller number for group switching. "