Object position controlled by time

Question

So, i want to control the position of a white box by using expressions because i can't use keyframes as i want (or i'm just stupid).
I already have
a = thisComp.layer("White box").effect("Sound Keys")("Output 1")*1;
b = thisComp.layer("White box").effect("Sound Keys")("Output 2")*1;
c = thisComp.layer("White box").effect("Sound Keys")("Output 3")*1;
y = a,b,c;
value - [0,y];
in the white box's expressions, so what i can do now to control the box's position with time?

Answer 1

Just a shot in the dark:
if (time > 5)
  mult = 3
else
  mult = 1;
a = thisComp.layer("White box").effect("Sound Keys")("Output 1")*mult;
b = thisComp.layer("White box").effect("Sound Keys")("Output 2")*mult;
c = thisComp.layer("White box").effect("Sound Keys")("Output 3")*mult;
y = a+b+c;   // is this what you meant?
value - [0,y];
You could also tie the mult variable to a slider control, which you could keyframe over time.
Dan