1> The irritating ones are 3rd party/ Filmy songs one. Very cheap and dose'nt serve the purpose.
2> All my cars came with OEM reverse tones. They use the security hooter to make small beeps. The beeps aren't that loud and I am actually thankful for them. They're useful when reversing in crowdy ares. Because most people don't even recognize reverse lights.
3> GrandRK, Please visit HASS and get it disconnect with a small fee. The safest way.
Where I am from I have never met a reverse alarm that is irritating to the ears. They are never that loud to the point where you are houses away and still be hearing it. Even if I was 3 -4 car lengths away and sleeping I have never heard of any that could actually wake me up.