Are you referring to Character Animator?
I've moved your post from the Lounge to the Character Animator forum where you are more likely to get an answer to your question
1 person found this helpful
Is it possible to record a scene with starting no wind and then more wind.
With recording enabled for the wind strength behavior, vary the parameter while recording.
Set the maximum wind strength you want and record that, and then adjust the take in the timeline by dragging the fade corners