Hi there, @Adore 
Thank you so much for your feedback!
You’ve brought up some really interesting points, and I’ve discussed them with our devs. Here’s what they shared:
We chose sounds that are quite universal, so each of them can work well for any of the 3 available actions.
Since the sounds are pretty versatile, any of them can fit different use cases. That said, here are a couple of combinations our devs personally recommend:
a) Open Window - No Sound, Messages - Bubble
b) Open Window - Soft 2, Messages - Click
We’d also like to mention that having no sound can be a perfectly good choice too. You don’t necessarily need to set a sound for every action.
For messages, we’d especially recommend Bubble, Click, and Soft. They’re short, gentle, and easy to recognize.
Just to make sure I understood this part correctly, do you mean cases where the Greeting appears above the chat bubble after a delay?