V1.1 has something more pleasant, but some users (don't know what percentage) actually liked the old sounds better.
What do you do in a case like this?
IMO, even making the old sounds an option is not a good idea because I think they are really irritating in comparison to the new ones for most people.
When it comes to features in apps in general, I've noticed that no matter how bad a feature is, or how awkward the UI, there's always somebody out there with lifestyles (or senses) so bizarre that it was the killer feature for them.
Notice how many still want a stylus to click buttons when the screen now works with fingers. There are even some who've trained their voice to. speak. in. the. cadence. of. their. voice. recognition. software and resented it when a newer version came out that could handle natural speech.
Sorry to answer your question with a question (or three), but comparing your answers to these questions will give you a good context for choosing a solution.
People who want to give you money are asking for something. Consider cooperating with them for said money.
But yes, this is more of an issue when they pay.