[Chiara Morlacchi]

Thank you very much Jason!
Actually I just spent all afternoon rewriting the entire expression (combining the two)
and at the end it worked! (i’m very surprised!)
But thanks anyway for your advice, i’ll have a look in case of any other evenience!

If anyone could ever need it, it’s this:

yScale = 100;
xScaleZero = 0;
xScaleMask = thisComp.layer("SCALE LINES").transform.scale[0];
min = [xScaleZero,yScale];
max = [xScaleMask,yScale];
t1 = key(1).time;
t2 = key(2).time;

// Ease and Wizz 2.0 : outQuint : All keyframes
// Ian Haigh (https://ianhaigh.com/easeandwizz/)
// Last built: 2009-01-08T11:11:54+11:00
// some defaults

var p = 0.8; // period for elastic
var a = 50; // amplitude for elastic
var s = 1.70158; // overshoot amount for "back"
function outQuint(t, b, c, d, a, p) {
return c*((t=t/d-1)*t*t*t*t + 1) + b;
}

function easeAndWizz() {

var dim = 2;
t = time - t1;
d = t2 - t1;
sX = 0;
eX = xScaleMask - 0;
sY = 100;
eY = 100 - 100;

if (time < t1) {
return min;
}
if (time > t2) {
return max;
} else {
val1 = outQuint(t, sX, eX, d, a, p, s);
switch (dim) {
case 1:
return val1;
break;
case 2:
val2 = outQuint(t, sY, eY, d, a, p, s);
return [val1, val2];
break;
default:
return null;
}
}
}
(easeAndWizz() || value);