Main Track View > Curve Editor > Track View toolbar > Scale Values
Track View > Curve Editor > Keys menu> Scale Values
Scale Values is used to proportionally increase or decrease the vertical distance between selected keys on the function curves in Curve Editor. It uses the Scale Origin Line as a movable reference point for the scale operation. Practically speaking, scaling values always creates spatial adjustments, rather than temporal. To scale in time, use Scale Time instead.
Note: Scale Values is not available in Dope Sheet mode.
To scale key values:
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Select an object in the viewport, then right-click and choose Curve Editor.
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Highlight one or more tracks, if necessary, and then highlight the keys you want to scale.
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On the Curve Editor toolbar, click Scale Values.
The orange Scale Values Origin line appears at the 0 location on the vertical scale.
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Drag the Scale Values Origin line to where you want to scale values from or to.
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Drag any highlighted key vertically to scale all of them.
Tip: If you use Lock Selection after highlighting the keys, you can drag anywhere in the Key window to create the scale operation.