Parking sensor volume

I have returned to owning a Vrs after nearly 10 years as I want to have a cheap, fun and reliable car so we can over pay on the mortgage ( and perhaps retire a bit early!). It's a 92k miles model and looks a bit care worn. However I had forgotten how much fun and how comfortable it was! I do how they survive as a classic. My question; is there any way to increase the volume of the parking sensors as they are extremely quiet and incidentally don't seem to start working until you are very near any obstruction. Thanks