Slider control updating value

[Andrei Popa]

If you want to create some sort of dependencie between frames, i think you should use time. something like
keyFrameVar = thisComp.layer("Black Solid 2").effect("Sound Keys")("Output 3");
frameNumber = time/thisComp.frameDuration;
value + keyFrameVar*frameNumber

this way you multiply keyFrameVar by the number of frames(like adding it for each frame)

Andrei

[Crichton Meadows]

Unfortunately, I can’t use time. I need the value to be an accumulation of over time of another input.
What I don’t understand, is that the ‘value’ variable seems to always be set to the initial value at the first rendered frame.
When the expression returns a value, I expected that to be stored for example in the slider and when the next frame is rendered the ‘value’ variable would be the current value of the slider.

[Andrei Popa]

After Effects expressions have no memory. Each frame they execute your code from zero. Nothing is saved over time except time. But i think that there is some workaround for your problem. You can execute the code for the whole addition each frame. The downside is that if you have a very long composition it will start running slow.

keyFrameVar = thisComp.layer("Black Solid 2").effect("Sound Keys")("Output 3")
frRate =1/ thisComp.frameDuration;
keyFrameSum = 0; //
for (i=1; i

Andrei