I dont get it. if wanting to edit multiple events thus leaving this control off, I can still only edit one event at a time… and then, changing settings of say something like musical mode, or time stretch algorithm for multiple events, also this does not work…
so… I have to change a time stretch algo on events… one by one… if there is 100 events???
I’ve never been able to get multiple event editing to work. I assumed it was something I was doing wrong, or maybe it’s just not supposed to be implemented. But then I have no idea what that button is for. So, I don’t think it’s just you 
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Same here: that function just doesn’t work!
I just tried to do the same thing… Edit audio warp markers for multiple events that are part of a group.
It does nothing. Sad.