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

Hello I got a quest?
Where can i change the velocity so it triggers the pad as loud as 
possible no matter how hard or soft i hit the pad?  also whenever i 
play back sequences it sound like sometimes the sounds are loud then 
after a few moments it goes low and muffled sounding--and vice versa? 
How can i make the sounds consistent throughout without having it 
change over time?  I hope this makes sense.  any help is 
appreciated!! thanks to all!! take care