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

hello
 i like to use my mp7 to control my mpc  and use the nice grid mode 
to lay down nice drum patterns.
 the grid mode gives me the ability to really make some  thick drums.
 the problem is when i have the midi going
 i have to turn down the  sounds on the mp7 or they play.
 and when im  done doing midi and want to play say  a bass sound  the 
mp7 still plays the mpc drums.
 for example
 say i  have midi tracks on 1,2,3,4
 and on 5 i want to play bass, well i can hear the bass and i can tap 
it in but after if  records one time through it plays drums back 
instead of bass.
 this is really crazy and i have read the manual but to no avail.
 does anyone know how i can fix this?
thanks alot.