EXS 24 Logic Sampler Users Group

I'm working with EXS piano samples, some which came bundled with EXS, 
others not.

The samples I see do respond to the right (sustain) pedal -- recognized 
as Control 64 within the MIDI environment.

However, the samples I see do not respond to the middle (sostenuto) 
pedal -- recognized as Control 66 within the MIDI environment.

If I edit the Logic file using window #2  (events), I notice that if I 
manually edit Control 64, recognized as EXS#1, to Control 66, assigned 
as EXS#3, at least half the time the behavior changes to what I would 
expect from the middle pedal (why the other half not remains a mystery, 
but that's not my burning issue at hand).  So I know that the samples 
themselves will respond to the middle pedal if that pedal is 
recognized.

How do I configure a sample within EXS to recognize the middle pedal 
when I'm actually playing the keyboard?

I've tried to edit the EXS keyboard.  There is a section for control.  
When I did what seemed obvious to me, the sample did not respond as I 
anticipated.

Cheers,
Larry