EXS 24 Logic Sampler Users Group

I'm trying to switch EXS in Logic Studio (8.1) from poly to legato
using a pedal switch.
The Logic 8 manual does not even list the controllers for any of these
functions, though Logic 7's manual tells me it's CC 71.

But I can't seem to get CC71 (or any other controller) to talk to EXS
in either version of Logic - is there something I'm forgetting about
here?

-- 
with best wishes,
John
http://abram.ca