EXS 24 Logic Sampler Users Group

i've imported a GM/GS SoundFont. was hoping to set up a system that 
would use the exs24 (multichannel) to play Standard Midi Files. 

Q.: How do I get the exs24 (mc) to understand the midi program 
change commands coming from the SMF so that it will CHOOSE THE RIGHT 
INSTRUMENTS?

ben