Finally, I have added a curve attenuation slider! 
^^ ^^ 
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It’s the slim slider. With it it is possible to form curves automatically up to 32 + 1 points. The generated curve is always increasing. Then it is possible to invert it.
Here is the example of an envelope divided into two parts:
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For more details:https://forum.renoise.com/t/development-of-vpdpro-automa32-some-demonstrations/48454
So far, this is the most complicated thing that I have managed to program with LUA. I am pleasantly surprised with the results…