Very cool effect!

Two things that I'm noticing though (AF ver 7.0) are that I did not get the error message regarding the period, and also when I change the period slider control I don't see any difference in the effect.

Know why?

Colin,

This time I get the error message: "Class 'Layer has no property or method named 'varAmp'. (error occured at line six).

hey, new guy here.

Really cool, but like Martin said, it would be great if there were a tutorial on the practical side of using this expression.

Anybody know?

When trying to use this expression text I get the message:

"Function sqrt is undefined. Expression disabled."

Any ideas? Thanks.

When trying to use any of these expression texts, I get the message:

"Expression result must be of dimension 2, not 1. Expression disabled."

Any ideas? Thanks.