One other thing to consider,
In the case of a MIDI track you might want to consider using the
By using Dissolve, every instrument in the track (kik,snare closed hat,open hat etc)
gets its own vsti and its own rail in the mixer.
At that point you can group tracks so you can turn (for example)
all cymbals or all toms etc up/down.
Or do things like, add reverb,eq,fx to the snare and toms but not the the kik and cymbals etc.
Of course you can change velocity in the MIDI track itself but be careful because
different velocities can change the sample sound.
it is better to get the sound you want first and then change volume (fx. eq etc) levels in the mixer.