I wish they would have two different sounds depending on whether it was a successful transaction or not. The duck/goose sound for card read errors, wrong password, pulled out card too early, pushed the cancel button, and the doorbell sound for Thank you you transaction is complete.
After the 3 years of goose honks, I could successfully completely tune it out at other registers and my brain could just barely register it on my own. Now with the new sound I feel like I am working in one of the stores they used to have where you could test the door bells and there was always 3-4 tests going on at the same time.