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

I am a new user and I'm having difficulty trying to record a bass 
line. (or any seamless loop track) My goal is to record a realtime 
bass line that repeats itself without a pause after, say 8 bars. I 
hit record and try to begin playing right when the clock starts. I 
play for 8 bars and try to stop at the end. When I play it back there 
is usually a pause in the performance. What I want is a seamless 
loop. I don't get it? How do I record a track that starts and ends at 
the 1.1 and 8.4? 

Thanks for your time!

Darren