Debit/Credit Card Machines

We've all gone through the process of swiping our card and entering our pin and saying "No" to cash back..

But I have never had a machine make a noise when is shows a new screen or change the UI in some way to grab my attention to act. So after I click continue and it starts to process some stuff and I lose attention, I waste a few seconds before noticing I have to click another button.

I little "beep" sound or at least a screen flash or something would save 1-3 seconds of my day..