Blurring or censoring multiple faces in the same clip

Thanks a lot for responding, Tom. I was hoping you'd chime in. ;-)

Here's a grab of the preview window with the first instance of the draw mask checked and the pixellate effect applied and the desired face obscured (circled):

Here I've disabled the first mask in the inspector and enabled the second one, and again, the corresponding face is pixellated (circled):

And here it is with both masks enabled; note that now neither face is pixellated as it should be:

I'll also note that when I play the clip with one or the other mask enabled in the inspector, the keyframed effect tracks the faces just fine.

Thanks in advance,

Steve

Tom, I very much appreciate this suggestion and I will give this workflow a try. I am new to this kind of effects-plus-keyframe work, and I was aware that there is more than one way to get most things done in Final Cut Pro. Up until now I have been using Draw Mask to apply the mask and key frame it to the movement of the face. Then, I applied whatever blur effect I wanted by dragging and dropping it onto the clip. But somehow I think your methodology is simpler and makes more sense. I will give it a try and report back if it works, for the benefit of others. Thanks again!

Tom, thank you, this is working. I'm using the Censor effect and applying an instance for each face I want to blur in a particular clip, and key framing each one separately. It works!

One other question: Is there a way (besides using the Blade tool to split the clip) to terminate an effect in the middle of a clip, so that (in this case) a stray blob of pixellation from a no-longer-needed effect isn't hanging around, unwanted, beyond the end of the time it's needed?

Thanks for everything!