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Yes, I regularly use rolls in timpani that are controlled by mod wheel for dynamics. They are looped. I think the snare rolls are though I have never done a long one on snare drum! One thing to keep in mind is that you can instantly switch from velocity crossfade to note-on dynamics or vice versa, to create very realistiic dynamics beyond either individual setting. I have recently been doing some accented timpani roll crescendos by hitting a single note loud, then within a couple microseconds switching to velocity crossfade on a roll. Thanks to MIDI protocol the note-on sound continues on the sustain but is then followed by the crescendo via crossfade which sounds exactly like the live performance. Other similar switches allow for various effects with rolls.