Kerning in a variable font environment

I am working on a variable font with 4 masters, each with different kernings.
I understand that if you have a pair in only one master you should add a zero value in all masters so that animation using Drawbot will be smoother. Is that true?

Is there a way to look up all my kerning pairs and add a zero value in the other masters where there is no kerning for that pair?

Check the mekkablue script Zero Kerner, it will do exactly that.

Glyphs should handle that automatically (at least it should).

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Found it! thanks