A typical channel on the Mixer page
You can also adjust the levels of the in, out, and sub mics on the kick, the top and bottom 
mic on the snare, and the amount of snare mic bleed when the kick and toms play.
Additional controls for the Kick and Snare channels
2.2.4
Adding and Removing Drums
 
If you will not be  using  a  particular  drum,  cymbal  or  percussion  instrument,  you  can  re
move it from the kit, thus freeing up more computer memory. To do this:
1.
Click on the Kit tab.
Quickstart
Editing the Drums
 
STUDIO DRUMMER - Manual - 10