Here is simple tool to help humanizing:
Randomly pick desired percent of notes from a selection; for each picked note apply random velocity between configurable minimum and maximum.
You can use it many times on the same selection with different percent and velocity values to get desired effect.
Could you please add the option to have this tool work on the pattern selection in the sequence list? This so you can randomize more than one pattern-track at a time .
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, better learn LUA us selfs!