Emu XL-7 & MP-7 User's Group

Hi everyone,
I'm having trouble getting the effects setup properly on my MP7.
What I want to do is select maybe a reverb for FX A and an echo for FX
B and then have a couple of knobs on each preset be assigned to FX A
send and FX B send, so I can have several tracks/channels running and
tweak the fx sends on the fly.
If you're familiar with General Midi, I would just use CC# 91 and 93
on each midi channel (for reverb and chorus).
I know the MP7 is far more powerful than a GM tone generator but I
just can't figure out how to do this.
All help is greatly appreciated.
kaojyan