I made a rhythm game in Scratch, but it works just "ok". I need to do something different now. I know each clone should be checking the time to "know" where it should be, but I don't know how to do this yet. Any ideas?
It would probably help people help you if you give a pointer to the Scratch project.
Actually, after a few days after the 3.0 release, the project broke. 
Even a non-working project would help us understand better what you're trying to do.
Actually, I can't even get into the project to see the code.