any settings that you applied under allow changes on the blurs page are carried over to the custom page. you can further customize your effect using the following:
. intensity use this to change the amount of blurring in your clip.
. alpha-key blending color if your clip contains an alpha channel, you can change the alpha-key color that is used to blend your blurred clip with the underlying (background) clip. to do this, click the
button to select the color you want.. border softness use this to adjust the softness on the border of your clip.