Hello John,
Thanks for the answer.
However it is not that clear.
First I get a black image and cut it thin (like a line) using Effects, Movement effects, Size/Position.
From this onwards: “…set the width to what you require and the height to 1px , or the height you require, apply keyframe animation as you require…” is not clear.
Will be thankful if you are kind enough to show in some screenshots.
Regards.