object position controlled by time

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?