arrays in real time

Hi there

I would like to play with arrays interactively in bge. Is there a way to manipulate in real time the object which drives the “object offset” of the array in order to see the entire array move in the game ?
It seems that creating an action and using the “shape action” actuator isn’t the right way to proceed, and using the “ipo” actuator doesn’t give me better results.

Thanks for any idea / suggestion / link