ValueAtTime and transform.scale.value[0] in a content group

Hi,

It's driving me crazy so, before jumping from the roof, I'd like to be sure it can't be done.

Here's my point :

What I've got : layer shape with a lot of content groups.

What I want : to move each of content group after the previous one with a delay.

For example, a square would follow a circle path with a delay of 1 second. A basic things with layer and that old ValueAtTime.

I get the previous content group name and my square move at the same time of my circle with :

groupIndex = thisProperty.propertyGroup(2).propertyIndex;
groupName = thisLayer("Contents")(groupIndex-1).name;

P = thisComp.layer(index).content(groupName).transform.scale;
x = P.value[0] ;
y = P.value[1] ;

[x,y]

But I can't find out how to add a delay to it, I've tried all kind of syntaxes, watched all kind of videos...

How could I get the "value at time" from previous content group ?

Luke, you're my only hope...

Thanks.

Best regards.

GP