Hello Gale,thanks for the link which was just the information I had. OK, I did not realize it applies to selections, but still I do not find answers for my question. To me, it looks a bit like the command tries to find a possible zero crossing according to average volume for both edges so that one could not - for example - only find a crossing for one edge. However, by now it worked by listening carefully and changing the selections to hear no clicks.
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