Is it possible to have an expression add 150 to the value every frame?

[Kalleheikki Kannisto]

Yes. In the simple case:

v = value;
if ([pick-whip some property value here] >= 2) {v = v+150};
v

As long as both the pick-whipped value and the target value are one-dimensional (not arrays), it will work. Arrays are slightly more involved, but not much.

[Nik Ammerlaan]

That only seems to add 150 just once. Is there a way to have it repeat or something?

[Kalleheikki Kannisto]

Oh, sorry, I misunderstood the question: Keep increasing, not just increase once.

In that case, this would be the code:

v = value;
fd = thisComp.frameDuration;
n=0;
inc=1;
while(inc == 1){
if([pick-whip a property value here].valueAtTime(time-fd*n)>=2){
n=n+1}else{
inc = 0}
}
value = value + 150*n

This version keeps increasing value 1 as long as value two>= 2 and resets value 1 to original (or keyframed) value when value 2 falls below 2.

If you need the value to keep increasing through the whole duration of the footage whenever above the threshold, you’ll need the while loop to check for values for ALL preceding frames in the comp, (until time-fd*n<= 0) and increment n for every frame the condition is met.