We really haven't sent anything that's very 'loud' out into space though. A little probe without even an active transmission process is not a very loud signal.

We really haven't sent anything that's very 'loud' out into space though. A little probe without even an active transmission process is not a very loud signal. All of the electromagnetic noise we emit is barely perceptible above CMB once you get even a small distance away. On a galactic scale, we have been almost entirely silent so far.