EXS 24 Logic Sampler Users Group

When using EXS24 virtual instruments, I can always hear the instrument 
in record and playback (set up as an audio instrument, using MIDI 
controller to play into the virtual instrument).  However, I can't seem 
to record to audio.  All my MIDI instruments go easily to audio upon 
record; I have them set up through OMS.  What step am I missing to 
record virtual instruments to audio?  For that matter, I can't seem to 
grasp how to mix multiple audio tracks to one stereo track.

Thanks,
Larry

P.S. I have read the FAQs, but maybe I missed something.