Questions about envelope in number sequence for particles

I have been trying to search everywhere and couldn’t find a solid explanation on what the envelope modifier does in the number sequence editor for particle effects.

From my experience with it, It seems like it smooths out the transitions from each key point, but I can’t confirm this.

Does anyone have any explanation on what does?

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it’s to set a random size with a specific minimum and maximum value.
it won’t go higher or lower than the light-red zone on the Timeline.


Ah thanks! I had a feeling it was random.

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When does it choose this “randomness”? When the server starts (or generally when NumberSequence initializes) or every time the value/keypoint is being read?