I hate to say that something *can't* be done, but my understanding is that the whole point of aliasing blocks, and repeating a pattern sequence, is that you are working with literally *identical* items.
I often find aliasing useful when I want to tweak percussion elements across several blocks/sequences. Changes I make in any of the aliases (or the original) are replicated to all of them. When I am happy with the results I remove the aliasing; each block is now an interdependent unit. I then add assorted flavoring (sporadic delays, gain automation, "humanizing", and so on).
Thanks, I was afraid of that. That's how I work with MilkyTracker - duplicate patterns to sketch in the song, then clone them to add parts to later versions of the same pattern. The problem is, once you've cloned and modified it's harder to make changes to the underlying song.
I guess I could put most things into phrases. Then the patterns mostly contain variation info, like volume changes.
Or with MIDI, maybe put a bunch of MIDI control instruments on one track - that track doesn't get aliased, but controls all the MIDI channels. Or MIDI codes directly in the tracker. (Or I could accept that most useful development of a song is muting/unmuting parts, not turning knobs).