I really like the diminuendo, staccato horn feature on the Volt, miss it, wish it were on the Bolt. It's perfect for encouraging text-zombies to move along.
I was very surprised to find that the Bolt doesn't have this, too. I use it in our Volt all of the time. It's loud enough, but doesn't cause pedestrians to jump out of their shoes, as with a horn. The EV-1 (20 years ago!) had this feature, too.
It's not like we can rev the engine, either. Oh well, first World problems...