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

I am a Mp-7 newbie, and for some reason, I am not getting any sound 
out of my tracks after track 7a. If I go to track 8a, 9a, etc I am 
getting no sound from the pads. What could I be doing wrong, or what 
do have have turned off. Anyones help would greatly be appreciated!!