Mass MIDI mute

Well, there is a CAL script that will split each drum note to its own track, if that's what you want to do.
 
It is called 'Split Note to Track.cal', and here is the doc at the beginning of the script:
 
"
;
; Split Note to Tracks.cal
;
; This routine modifies a source track, splitting it by note# into
; separate destination tracks. Only notes are split ... all other
; track parameters (Controllers, Tempos, Meters and Markers),
; if any, remain in the source track.
;
; Use this routine for splitting up a drum machine or other type
; of instrument track where voices are assigned by note number.
;
; = Courtesy Red Nile Productions 1993 (714)498-7515 CIS:70044,2733
;
; = Modified 12/10/93 by Greg Hendershott at user's request to
; have this display notes as names (like C#5) rather than numbers
; in the track names. Caveat: The note names always use sharps
; and assume BaseOctave=0."
 
Bob Bone
 
 

I believe you want to run the "Split Note to Tracks" CAL script. This will break out a MIDI track into individual tracks, one for each note. This makes muting individual notes easy. Another way is isolate the drum kit elements in Session Drummer is to work on the audio side. There is a stereo pair for each drum pad in Session Drummer. The easiest way to setup a multi-out instance of Session Drummer is using a track template. Right-click in the track view track header, select a template from Insert from Track Template > Soft Synth Track Templates > Session Drummer 3.