I can definitely help you if you are working with fraps on the lipsync! However, I use sony-vegas (I pay for it via my side-job) so I can't help you there. I'll have to study up on it a bit ^w^
All right. here we go:
.~. => Lipsync can be improved by copying the singers' accent and the time they hold onto a note(s) (Such as the singer going "AWOOOO" = Awoooooouuuuiiiieeeoooouuuuuuunnnnnnn)
.~. => The clips can be improved by lengthening the time the singer sings (fixed by lipsync.) You can also cut to the teeth of when the character starts singing and ending it so that your clips are synced in-time well.
.~. => And the effects can be used better by using them /intentionally./ Such as a reference to what the singer is singing about. If it's a dark part of the song, you can grey your video and add some black borders (thickness depending on what you want)
I don't use this account to post videos any-more, but here is what a video from me back in the day (cough-cough when I was working on it but getting there) with my lipsync/editing. The pan/cropping and some of the clip transitions are a bit awkward, but you have a goal lol. <3
https://www.youtube.com/watch?v=S863ej9DLs8