By doing it the way you described, the highlighting doesn't work. The autoscroll function works, but it will not highlight current line. In the song I sent you, I made every single line yellow, ending up with the whole verse yellow and no highlighting.
I think I prefer it the way it was.
This is how I edited the text:
[00:12.00]{c:yellow}Well bless my soul, what's wrong with me?{c}
[00:15.33]{c:yellow}I’m itching like a man on a fuzzy tree{c}
[00:18.43]{c:yellow}My friends say I'm actin' wild as a bug{c}
[00:22.36]{c:yellow}I'm in love, I'm all shook up{c}
[00:24.52]{c:yellow}Uh huh [E]huh, [F#] ohh yeah, yeah!{c}
[00:30.00] {c:yellow}Well my hands are shaky and my knees are weak{c}
[00:34.14]{c:yellow}I can't seem to stand on my own two feet{c}
[00:37.63]{c:yellow}Now who do you thank when you have such luck?{c}
[00:40.42]{c:yellow}I'm in love,I’m all shook up{c}
[00:43.03]{c:yellow}Uh huh [E]huh, [F#] ohh yeah, yeah!{c}