Don't spend weeks learning LUA scripting. Spend minutes creating beautiful effects.
While Aegisub has a built-in "Karaoke Templater," advanced users often download modified scripts to handle more complex logic: --- Aegisub Karaoke Effect Template Download -FREE-
You can paste this into a .ass file to get a simple karaoke effect (syllables change from white to yellow): Don't spend weeks learning LUA scripting