🚀 go-pugleaf

One problem with that last expression is that it will just switch immediately from the original value to the 'expressedValue'. This solution allows you to define a period over which it will transition between the two.

// user defined variables
framesBeforeStart = 50;
framesToTransition = 10;

expressedValue = value;
secondsBeforeStart = framesBeforeStart * thisComp.frameDuration;
secondsToTransition = (framesToTransition * thisComp.frameDuration) + secondsBeforeStart;
if (time < secondsBeforeStart) { [NL] 	value; [NL] } else { [NL] 	// this is where you put your expression [NL] 	expressedValue = [0,0]; [NL] } [NL] // move from original value to expressed value over the transition time [NL] linear(time, secondsBeforeStart, secondsToTransition, value, expressedValue);

NOTE: replace [NL]s with line returns

Paul T