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

i've been having problems with a pattern i created and am trying to 
figure out what's making it behave the way it is.  it almost acts 
like i am maxing the polyphony but i don't see how i can be.

there are only two tracks in the 32 measure pattern, one is some 
live keys and the second is a pad.  with the pad, i recorded a 16 
measure single note on 1.1 and 17.1.  However during playback only 
the note on 1.l will play and when 17.1 rolls around it pretty much 
just skips the note on for the pad the second time.  

However, when i start playback at 17.1, it will play the note-on and 
when the pattern loops back to 1.1 the pad continues, but as it gets 
to 17.1 a second time, it cuts out again.

I also noticed that sometimes the pad will abruptly stop playing 
only a couple measures into the pattern when it should last for 16 
measures.

I tried to erase all controller events with no success and I also 
tried to copy the note from 1.1 and paste it to 17.1 with the same 
behavior.  I eventually erased all pattern data and rerecorded it, 
but again with the same results.

Finally, I just cut it down to a 16 measure pattern and the pad 
loops fine over and over.  so i'm scratching my head here.

any ideas of where to troubleshoot this?