Test an Effect on a Selected Clip
Software: Apple FCP X
Hovering your cursor over an effect in the Effects Browser allows you to see what the effect will look like on a selected clip in the Timeline. This is handy for obvious reasons: it’s best to preview an effect before dragging it onto a clip in the Timeline and having it start to render.
However, there’s a more flexible way to view an effect on a clip: press the Option key while hovering your cursor over an effect in the Effects Browser and as you drag from left to right, the initial setting for the effect will increase before your eyes. Why is this helpful? You can see whether adjusting the settings will improve the effect on your clip or not.
*This technique does not work for all effects; it works best for Blurs and Looks.