MIDI drum volume (envelope) madness - Battery 3, SI Drummer

No, it's not viable to use MIDI Volume to manage levels or note muting in a drum synth because all of the parts are being driven by the same MIDI channel so there's no way to distinguish which envelope controls which instrument output (audio) channel. There may be exceptions to this, but generally drum synths don't differentiate MIDI channels; MIDI CC7 arriving on any channel controls Master Volume, and that's it, unlike a multitimbral synth that associates a separate MIDI channel with each instrument/audio channel.
 
So instead of automating MIDI volume, you need to set up a separate Audio track to host each output channel of the drum synth, and automate audio volume on those tracks.
 
That said, using audio volume to mute individual hits is a very awkward approach. If the sequences are being played by Battery's internal pattern player, it will be much easier in the long run to drag them into a MIDI track, assign a drum map to the track so you can easily differentiate the parts by kit piece/articulation names in the Drum Pane of the PRV, and edit the MIDI to remove notes or otherwise rearrange the patterns. Just remember to disable Battery's internal pattern player once you've move everything to a MIDI track.

I can confirm what both these gents are saying as I do the exact same thing.
Route everything to separate tracks and create a volume envelope using automation.
This is helpful with Crash hits that are cupped off quickly when a dead silence is needed.