Alt+Right click is the default binding for the in-game ping system, iirc.
Other than that, you'd have to search the Keyboard shortcuts in KDE settings for ALT+ to find what's causing the sound.
Yeah I did, and as far as I could tell all of the shortcuts with alt also include some extra modifier.
It's definitely a KDE sound though, it's the default system bell sound.
There are some key combinations to enable/disable sticky keys. Maybe that's it?
I don't see a shortcut for sticky keys in the keyboard settings, that's probably not it. Also haven't noticed any different behaviour after the sound plays.
Sticky keys are a Windows thing so it wouldn't be in the game settings
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