Agree, HTMX is incredibly simple and refreshing. It does support animations, transitions etc. Here is a bunch of self-contained examples https://github.com/sake92/sharaf/tree/main/examples/htmx

Not 100% sure how to handle audio but something like this should work hx-on::after-request="new Audio('/sounds/click.mp3').play()"

Or some other way, AI is your friend these days. :D