expression.Amount
expression Required. An expression that returns one of the objects in the Applies To list.
Example
The following example adds a shape, and a 90-degree spin animation to the shape.
Sub SetAnimEffect()
Dim effSpin As Effect
Dim shpCube As Shape
Set shpCube = ActivePresentation.Slides(1).Shapes.AddShape _
(Type:=msoShapeCube, Left:=100, Top:=100, _
Width:=50, Height:=50)
Set effSpin = ActivePresentation.Slides(1).TimeLine _
.MainSequence.AddEffect(Shape:=shpCube, _
effectId:=msoAnimEffectSpin)
effSpin.Timing.Duration = 3
effSpin.EffectParameters.Amount = -90
End Sub