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

Hi,
Just bought my XL-7 today at Guitar Center and it sounds totally 
awesome, it blew me away.  2 hours into playing and tweakin' knobs, I 
notices there were some lag time with some of the kobs.  All 16 midi 
slide tracks were playing full speed while I had Preset on, I pressed 
the Controller Function button to toggle between Quick Edit, Prgrm, 
Vol., Pan to find that the response time was really slow.  Toggling 
with the Track/Channel button while in Preset mode also seemed slow.  
While playing full speed, tried to mute tracks 1-8 with a quick slide 
of the finger also resulted in 2-5 seconds delay response.  This is 
my first piece of Hardware and I am curious to know if this is 
normal.  Is it because I was playing really loud with all Preset 
tracks running or is there a bug of some sort?  

Thanks for the advice