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

Hi there,
I'm trying to use my Yamaha AW16G DAW to start and stop the patterns 
on my XL-7. I can't figure out how to do this. I'm used to working 
with MIDI, and I've already checked that the cable is hooked-up 
properly (MIDI out on the AW16G to the MIDI in on the XL-7). All I 
want to do is press 'record' on the Yamaha, which will trigger the XL-
7 to start playing. Sounds very simple, right? When I press 'record' 
on the Yamaha - nothing happens at all. The XL-7 just sits there. What 
setting on the XL-7 do I have to change in order for it to receive 
MIDI start/stop messages from an external device? 
Fab