gaussian blur effect not working right using macro

Hi.  I am using a macro that applies a blur but it does not seem to change no matter how small I set the radius value.  Any help?

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Sub HaloSmooth()
    Dim OrigSelection As ShapeRange
    Dim s1 As Shape
    Set OrigSelection = ActiveSelectionRange
    On Error Resume Next
    Set s1 = OrigSelection.ConvertToBitmapEx(4, False, True, 300, 1, True, False, 95)
    s1.Bitmap.ApplyBitmapEffect "Gaussian Blur", "GaussianBlurEffect GaussianBlurRadius=1 , GaussianBlurResampled=0"
End Sub