keyframing the toggle on of an expression

[Eric Sanderson]

Well you could write an if/else statement with a checkbox…but an easier and just as effective way would be to just expression pickwhip your values to an expression slider…then just keyframe the slider.

if you dont know slider is under. “effect”,”expression controls” “Slider Control”. Then highlight your “340” and whip it to the slider value.

[Todd Kopriva]

In addition to the way that Eric describes, there are a couple of examples in After Effects Help (courtesy of Dan Ebberts) that show a couple of other ways to approach this, either by triggering on keyframes or markers or triggering on specific times:

“Expression example: Animate scale at each layer marker”

“Expression example: Start or stop a wiggle at a specific time”

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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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[Richard Altman]

thank you for the response, i am going to try that right now, it seems very clear, which for me is important. thanks again.