How to start my effect bouncing at specific time?

I'm trying to compile an expression preset to the rebound effect. Here is my code:

timeIn = effect ("Start Time") ("Slider");

In = timeIn.value;

timeOut = effect ("end Time")("Slider").

Out = timeOut.value

FREQ = effect ("Freq") ("Slider");

F = freq.value;

CSO = ('Lama & Tinggi Pentalan") effect ("Slider");

OSI = Osc.value;

Amp = effect ("Nilai Pembagi Landai") ("Slider");

A = Amp.value;

Tinggi = effect ("Besarnya Pentalan") ("Slider");

T = Tinggi.value;

If (time > = in & & time < = Out) {}

Y = T*(Math.abs(Math.cos(F*time*2*Math.PI))*Math.exp(-time/Osi*A));

position - (0, Y);

} else {}

position - [0, 0];

}

These are the works. My problem is that I had different bounce the result depends on the start time with the biggest bounce at 0 seconds and goes smaller when I put the highest value on it. It to look like just to show the result of the expression from the start time. How to manage my code to the sine wave may start on the departure time? Thanks for the help and sorry for my bad English because it is not my native language

Thanks Dan, it's work. You can't explain the subject more t = time elapsed - in? I'm not really the reason. I just want to understand I'm newbie here

Tags: After Effects

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