• quanzive = quantize. Grow/shrink selection is a nice thing, but not what I'm describing here in this issue.

This is probably one of the oldest feature requests but it never made its way over to the issue tracker, so thanks for posting it here. It would definitely be a useful feature to have.

Decade old forum topic for reference: https://forum.openmpt.org/index.php?topic=1139.0

Thanks, yes, that would be a wonderful feature addition! Yes, I think I've read that thread some days ago.

For starters, a function that just writes some random SDx effects next to the notes in the pattern selection (right click > note humanizing...), should be rather easy to implement. Refining this later could be a possibility then (a dialogue where you can set intensity, and the possibility for positive and negative values and humanize-unaffected notes). Negative could be done like that: Setting a specific note one row earlier automagically in the pattern plus giving it a SDx note delay effect, as well, to make it play a bit earlier by "mistake" i.e. humanizing.