Problem With Randomize Plz Hlp

Hi all.
I have problem with randomize in Renoise 1.5
i select some part of track and click on the selection -> randomize…
but no effect…

if click on the humanize, it is OK but randomize isnt do Anything …

Is it function for randomize notes ?

thank you

randomize only works on effect column, where commands have been already written (of course).

It does not affect volume of panning column