How to add UI sounds in Godot 4 the smart way 

i like it. that's good and really simple, and can be done through code to ensure you're not missing any

Yes, though that's be even more work, wouldn't it? Or am I misunderstanding your explanation?

Yes, modifying the sound would require adding some custom metadata to the UI elements that'd allow the setup script to alter it's treatment. I am not sure what could be a better solution, that wouldn't require forking all Control nodes and creating a huge mess with that. The approach show here is certainly not ideal, as it's also missing any elements inside modal UI windows (that are incorrectly scaled up anyways). Maybe it can be improved somehow. I'd be glad to learn new ideas here! - unfa

​@@liblast There is one way I can sort of think of off the top of my head, however its a massive hack and I have no idea on the performance implications or other possible breaks in Godot's system. But you could extend the stylebox resources with scripts, add a file export variable for the audio file, and try to detect on the first draw for the specific canvas item, and if that's true you play the sound. This might violate the styles system a little bit. Unfortunately since exports to resources are initialized after the _init function, you'd have to forward all your custom styleboxes to a singleton in the _init function in order to prep their audio streams, almost everything outside of loading and playing the audio streams has been tested by me on beta 9. (so I can't say for certain if _draw will work properly with calls to a stream player's play, note you should probably reference the stream player in the custom stylebox script and assign it with the singleton, also to note you should probably manage the sound via a setter and getter if you plan to support changing the sound by code and in game) This wouldn't be super difficult and you do get all the brilliance of the theme system doing this but again you'd be performing a massive hack to do it. Cool thing about doing this though is you do intrinsically integrate the inspector and don't have to hardcode anything. Even more is fairly efficient since resources are by reference, so its guaranteed to initialize the minimal amount you set it. One note is this would require setting up your default theme for each item you want sounds to come from. But you only have to do it once per element and you were already hardcoding it anyway.

using custom themes is what i thought this video was gonna be lol

such an underrated comment