Control scaling speed?

Video effect>motion>scale
The motion change is too abrupt. I'd like to scale the velocity
of the engagement of the motion, slower at first and then up to speed,
without specifying a bunch of control points to fake the acceleration.
None of those contextual menu items is doing it, even "ease in".
Messing around with the velocity parameters in the effects window
seems to change nothing at all.
Anyone?
Thanks, Steve z

Don't know if it is still being sold, but Grass Valley's Imaginate was the perfect application for your intended purpose. There are many others as well, but PR is not the program of choice for this.

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